N-BK7, BiConcave Lenses (Uncoated)

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Biconcave Lens 30mm Diameter −39.7mm Focal Length Uncoated
SLB-30B-40N

30mm

−39.7mm

3-5 days

58,50 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ30mm
Focal length f	−39.7mm
Edge thickness te	7.6mm
Center thickness tc	2mm
Back focal length fb	−40.3mm
Radius of curvature r	41.52mm
Centration	＜1′

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Biconcave Lens 15mm Diameter −14.7mm Focal Length Uncoated
SLB-15B-15N

15mm

−14.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ15mm
Focal length f	−14.7mm
Edge thickness te	5.9mm
Center thickness tc	2mm
Back focal length fb	−15.3mm
Radius of curvature r	15.57mm
Centration	＜1′

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Biconcave Lens 40mm Diameter −39.7mm Focal Length Uncoated
SLB-40B-40N

40mm

−39.7mm

3-5 days

45,70 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ40mm
Focal length f	−39.7mm
Edge thickness te	12.3mm
Center thickness tc	2mm
Back focal length fb	−40.3mm
Radius of curvature r	41.52mm
Centration	＜1′

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Biconcave Lens 15mm Diameter −29.7mm Focal Length Uncoated
SLB-15B-30N

15mm

−29.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ15mm
Focal length f	−29.7mm
Edge thickness te	3.8mm
Center thickness tc	2mm
Back focal length fb	−30.3mm
Radius of curvature r	31.14mm
Centration	＜1′

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Biconcave Lens 50mm Diameter −49.5mm Focal Length Uncoated
SLB-50B-50N

50mm

−49.5mm

3-5 days

51,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50mm
Focal length f	−49.5mm
Edge thickness te	15.8mm
Center thickness tc	3mm
Back focal length fb	−50.5mm
Radius of curvature r	51.9mm
Centration	＜1′

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Biconcave Lens 20mm Diameter −19.7mm Focal Length Uncoated
SLB-20B-20N

20mm

−19.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ20mm
Focal length f	−19.7mm
Edge thickness te	7.1mm
Center thickness tc	2mm
Back focal length fb	−20.3mm
Radius of curvature r	20.76mm
Centration	＜1′

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Biconcave Lens 50mm Diameter −99.5mm Focal Length Uncoated
SLB-50B-100N

50mm

−99.5mm

3-5 days

73,50 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50mm
Focal length f	−99.5mm
Edge thickness te	9.1mm
Center thickness tc	3mm
Back focal length fb	−100.5mm
Radius of curvature r	103.8mm
Centration	＜1′

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Biconcave Lens 20mm Diameter −39.7mm Focal Length Uncoated
SLB-20B-40N

20mm

−39.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ20mm
Focal length f	−39.7mm
Edge thickness te	4.4mm
Center thickness tc	2mm
Back focal length fb	−40.3mm
Radius of curvature r	41.52mm
Centration	＜1′

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Biconcave Lens 50.8mm Diameter −99.5mm Focal Length Uncoated
SLB-50.8B-100N

50.8mm

−99.5mm

6-12 weeks

49,40 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50.8mm
Focal length f	−99.5mm
Edge thickness te	9.3mm
Center thickness tc	3mm
Back focal length fb	−100.5mm
Radius of curvature r	103.8mm
Centration	＜1′

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Biconcave Lens 25mm Diameter −29.7mm Focal Length Uncoated
SLB-25B-30N

25mm

−29.7mm

3-5 days

35,20 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25mm
Focal length f	−29.7mm
Edge thickness te	7.2mm
Center thickness tc	2mm
Back focal length fb	−30.3mm
Radius of curvature r	31.14mm
Centration	＜1′

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Biconcave Lens 50.8mm Diameter −249.5mm Focal Length Uncoated
SLB-50.8B-250N

50.8mm

−249.5mm

3-5 days

49,40 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50.8mm
Focal length f	−249.5mm
Edge thickness te	5.5mm
Center thickness tc	3mm
Back focal length fb	−250.5mm
Radius of curvature r	259.5mm
Centration	＜1′

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Biconcave Lens 25mm Diameter −49.7mm Focal Length Uncoated
SLB-25B-50N

25mm

−49.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25mm
Focal length f	−49.7mm
Edge thickness te	5.1mm
Center thickness tc	2mm
Back focal length fb	−50.3mm
Radius of curvature r	51.9mm
Centration	＜1′

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Biconcave Lens 25mm Diameter −79.7mm Focal Length Uncoated
SLB-25B-80N

25mm

−79.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25mm
Focal length f	−79.7mm
Edge thickness te	4mm
Center thickness tc	2mm
Back focal length fb	−80.3mm
Radius of curvature r	83.04mm
Centration	＜1′

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Biconcave Lens 10mm Diameter −9.7mm Focal Length Uncoated
SLB-10B-10N

10mm

−9.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ10mm
Focal length f	−9.7mm
Edge thickness te	4.6mm
Center thickness tc	2mm
Back focal length fb	−10.3mm
Radius of curvature r	10.38mm
Centration	＜1′

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Biconcave Lens 25.4mm Diameter −29.7mm Focal Length Uncoated
SLB-25.4B-30N

25.4mm

−29.7mm

6-12 weeks

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25.4mm
Focal length f	−29.7mm
Edge thickness te	7.4mm
Center thickness tc	2mm
Back focal length fb	−30.4mm
Radius of curvature r	31.14mm
Centration	＜1′

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Biconcave Lens 10mm Diameter −24.7mm Focal Length Uncoated
SLB-10B-25N

10mm

−24.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ10mm
Focal length f	−24.7mm
Edge thickness te	3mm
Center thickness tc	2mm
Back focal length fb	−25.3mm
Radius of curvature r	25.95mm
Centration	＜1′

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Biconcave Lens 25.4mm Diameter −59.7mm Focal Length Uncoated
SLB-25.4B-60N

25.4mm

−59.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25.4mm
Focal length f	−59.7mm
Edge thickness te	4.6mm
Center thickness tc	2mm
Back focal length fb	−60.4mm
Radius of curvature r	62.28mm
Centration	＜1′

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Biconcave Lens 10mm Diameter −49.7mm Focal Length Uncoated
SLB-10B-50N

10mm

−49.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ10mm
Focal length f	−49.7mm
Edge thickness te	2.5mm
Center thickness tc	2mm
Back focal length fb	−50.3mm
Radius of curvature r	51.9mm
Centration	＜1′

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Biconcave Lens 25.4mm Diameter −99.7mm Focal Length Uncoated
SLB-25.4B-100N

25.4mm

−99.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25.4mm
Focal length f	−99.7mm
Edge thickness te	3.6mm
Center thickness tc	2mm
Back focal length fb	−100.4mm
Radius of curvature r	103.8mm
Centration	＜1′

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Biconcave Lens 12.7mm Diameter −19.7mm Focal Length Uncoated
SLB-12.7B-20N

12.7mm

−19.7mm

6-12 weeks

29,60 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ12.7mm
Focal length f	−19.7mm
Edge thickness te	4mm
Center thickness tc	2mm
Back focal length fb	−20.3mm
Radius of curvature r	20.76mm
Centration	＜1′

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Biconcave Lens 30mm Diameter −29.7mm Focal Length Uncoated
SLB-30B-30N

30mm

−29.7mm

3-5 days

36,40 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ30mm
Focal length f	−29.7mm
Edge thickness te	9.7mm
Center thickness tc	2mm
Back focal length fb	−30.3mm
Radius of curvature r	31.14mm
Centration	＜1′

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Biconcave Lens 30mm Diameter −49.7mm Focal Length Uncoated
SLB-30B-50N

30mm

−49.7mm

in stock

36,40 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ30mm
Focal length f	−49.7mm
Edge thickness te	6.4mm
Center thickness tc	2mm
Back focal length fb	−50.3mm
Radius of curvature r	51.9mm
Centration	＜1′

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Biconcave Lens 15mm Diameter −19.7mm Focal Length Uncoated
SLB-15B-20N

15mm

−19.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ15mm
Focal length f	−19.7mm
Edge thickness te	4.8mm
Center thickness tc	2mm
Back focal length fb	−20.3mm
Radius of curvature r	20.76mm
Centration	＜1′

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Biconcave Lens 40mm Diameter −49.7mm Focal Length Uncoated
SLB-40B-50N

40mm

−49.7mm

3-5 days

45,70 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ40mm
Focal length f	−49.7mm
Edge thickness te	10mm
Center thickness tc	2mm
Back focal length fb	−50.3mm
Radius of curvature r	51.9mm
Centration	＜1′

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Biconcave Lens 15mm Diameter −39.7mm Focal Length Uncoated
SLB-15B-40N

15mm

−39.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ15mm
Focal length f	−39.7mm
Edge thickness te	3.4mm
Center thickness tc	2mm
Back focal length fb	−40.3mm
Radius of curvature r	41.52mm
Centration	＜1′

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Biconcave Lens 50mm Diameter −59.5mm Focal Length Uncoated
SLB-50B-60N

50mm

−59.5mm

3-5 days

51,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50mm
Focal length f	−59.5mm
Edge thickness te	13.5mm
Center thickness tc	3mm
Back focal length fb	−60.5mm
Radius of curvature r	62.28mm
Centration	＜1′

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Biconcave Lens 20mm Diameter −24.7mm Focal Length Uncoated
SLB-20B-25N

20mm

−24.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ20mm
Focal length f	−24.7mm
Edge thickness te	6mm
Center thickness tc	2mm
Back focal length fb	−25.3mm
Radius of curvature r	25.95mm
Centration	＜1′

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Biconcave Lens 50.8mm Diameter −49.5mm Focal Length Uncoated
SLB-50.8B-50N

50.8mm

−49.5mm

6-12 weeks

51,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50.8mm
Focal length f	−49.5mm
Edge thickness te	16.3mm
Center thickness tc	3mm
Back focal length fb	−50.5mm
Radius of curvature r	51.9mm
Centration	＜1′

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Biconcave Lens 20mm Diameter −49.7mm Focal Length Uncoated
SLB-20B-50N

20mm

−49.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ20mm
Focal length f	−49.7mm
Edge thickness te	3.9mm
Center thickness tc	2mm
Back focal length fb	−50.3mm
Radius of curvature r	51.9mm
Centration	＜1′

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Biconcave Lens 50.8mm Diameter −149.5mm Focal Length Uncoated
SLB-50.8B-150N

50.8mm

−149.5mm

3-5 days

49,40 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50.8mm
Focal length f	−149.5mm
Edge thickness te	7.2mm
Center thickness tc	3mm
Back focal length fb	−150.5mm
Radius of curvature r	155.7mm
Centration	＜1′

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Biconcave Lens 25mm Diameter −34.7mm Focal Length Uncoated
SLB-25B-35N

25mm

−34.7mm

3-5 days

35,20 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25mm
Focal length f	−34.7mm
Edge thickness te	6.4mm
Center thickness tc	2mm
Back focal length fb	−35.3mm
Radius of curvature r	36.33mm
Centration	＜1′

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Biconcave Lens 50.8mm Diameter −299.5mm Focal Length Uncoated
SLB-50.8B-300N

50.8mm

−299.5mm

6-12 weeks

49,40 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50.8mm
Focal length f	−299.5mm
Edge thickness te	5.1mm
Center thickness tc	3mm
Back focal length fb	−300.5mm
Radius of curvature r	311.4mm
Centration	＜1′

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Biconcave Lens 25mm Diameter −59.7mm Focal Length Uncoated
SLB-25B-60N

25mm

−59.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25mm
Focal length f	−59.7mm
Edge thickness te	4.5mm
Center thickness tc	2mm
Back focal length fb	−60.3mm
Radius of curvature r	62.28mm
Centration	＜1′

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Biconcave Lens 25mm Diameter −99.7mm Focal Length Uncoated
SLB-25B-100N

25mm

−99.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25mm
Focal length f	−99.7mm
Edge thickness te	3.5mm
Center thickness tc	2mm
Back focal length fb	−100.3mm
Radius of curvature r	103.8mm
Centration	＜1′

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Biconcave Lens 10mm Diameter −14.7mm Focal Length Uncoated
SLB-10B-15N

10mm

−14.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ10mm
Focal length f	−14.7mm
Edge thickness te	3.6mm
Center thickness tc	2mm
Back focal length fb	−15.3mm
Radius of curvature r	15.57mm
Centration	＜1′

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Biconcave Lens 25.4mm Diameter −39.7mm Focal Length Uncoated
SLB-25.4B-40N

25.4mm

−39.7mm

6-12 weeks

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25.4mm
Focal length f	−39.7mm
Edge thickness te	6mm
Center thickness tc	2mm
Back focal length fb	−40.4mm
Radius of curvature r	41.52mm
Centration	＜1′

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Biconcave Lens 10mm Diameter −29.7mm Focal Length Uncoated
SLB-10B-30N

10mm

−29.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ10mm
Focal length f	−29.7mm
Edge thickness te	2.8mm
Center thickness tc	2mm
Back focal length fb	−30.3mm
Radius of curvature r	31.14mm
Centration	＜1′

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Biconcave Lens 25.4mm Diameter −69.7mm Focal Length Uncoated
SLB-25.4B-70N

25.4mm

−69.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25.4mm
Focal length f	−69.7mm
Edge thickness te	4.2mm
Center thickness tc	2mm
Back focal length fb	−70.4mm
Radius of curvature r	72.66mm
Centration	＜1′

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Biconcave Lens 12.7mm Diameter −9.7mm Focal Length Uncoated
SLB-12.7B-10N

12.7mm

−9.7mm

6-12 weeks

29,60 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ12.7mm
Focal length f	−9.7mm
Edge thickness te	6.3mm
Center thickness tc	2mm
Back focal length fb	−10.3mm
Radius of curvature r	10.38mm
Centration	＜1′

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Biconcave Lens 25.4mm Diameter −149.7mm Focal Length Uncoated
SLB-25.4B-150N

25.4mm

−149.7mm

6-12 weeks

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25.4mm
Focal length f	−149.7mm
Edge thickness te	3mm
Center thickness tc	2mm
Back focal length fb	−150.4mm
Radius of curvature r	155.7mm
Centration	＜1′

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Biconcave Lens 30mm Diameter −34.7mm Focal Length Uncoated
SLB-30B-35N

30mm

−34.7mm

3-5 days

36,40 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ30mm
Focal length f	−34.7mm
Edge thickness te	8.5mm
Center thickness tc	2mm
Back focal length fb	−35.3mm
Radius of curvature r	36.33mm
Centration	＜1′

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Biconcave Lens 12.7mm Diameter −24.7mm Focal Length Uncoated
SLB-12.7B-25N

12.7mm

−24.7mm

6-12 weeks

29,60 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ12.7mm
Focal length f	−24.7mm
Edge thickness te	3.6mm
Center thickness tc	2mm
Back focal length fb	−25.3mm
Radius of curvature r	25.95mm
Centration	＜1′

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Biconcave Lens 30mm Diameter −99.7mm Focal Length Uncoated
SLB-30B-100N

30mm

−99.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ30mm
Focal length f	−99.7mm
Edge thickness te	4.2mm
Center thickness tc	2mm
Back focal length fb	−100.3mm
Radius of curvature r	103.8mm
Centration	＜1′

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Biconcave Lens 15mm Diameter −24.7mm Focal Length Uncoated
SLB-15B-25N

15mm

−24.7mm

6-12 weeks

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ15mm
Focal length f	−24.7mm
Edge thickness te	4.2mm
Center thickness tc	2mm
Back focal length fb	−25.3mm
Radius of curvature r	25.95mm
Centration	＜1′

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Biconcave Lens 40mm Diameter −99.7mm Focal Length Uncoated
SLB-40B-100N

40mm

−99.7mm

6-12 weeks

43,20 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ40mm
Focal length f	−99.7mm
Edge thickness te	5.9mm
Center thickness tc	2mm
Back focal length fb	−100.3mm
Radius of curvature r	103.8mm
Centration	＜1′

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Biconcave Lens 15mm Diameter −49.7mm Focal Length Uncoated
SLB-15B-50N

15mm

−49.7mm

6-12 weeks

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ15mm
Focal length f	−49.7mm
Edge thickness te	3.1mm
Center thickness tc	2mm
Back focal length fb	−50.3mm
Radius of curvature r	51.9mm
Centration	＜1′

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Biconcave Lens 50mm Diameter −69.5mm Focal Length Uncoated
SLB-50B-70N

50mm

−69.5mm

3-5 days

51,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50mm
Focal length f	−69.5mm
Edge thickness te	11.9mm
Center thickness tc	3mm
Back focal length fb	−70.5mm
Radius of curvature r	72.66mm
Centration	＜1′

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Biconcave Lens 20mm Diameter −29.7mm Focal Length Uncoated
SLB-20B-30N

20mm

−29.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ20mm
Focal length f	−29.7mm
Edge thickness te	5.3mm
Center thickness tc	2mm
Back focal length fb	−30.3mm
Radius of curvature r	31.14mm
Centration	＜1′

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Biconcave Lens 50.8mm Diameter −59.5mm Focal Length Uncoated
SLB-50.8B-60N

50.8mm

−59.5mm

6-12 weeks

51,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50.8mm
Focal length f	−59.5mm
Edge thickness te	13.8mm
Center thickness tc	3mm
Back focal length fb	−60.5mm
Radius of curvature r	62.28mm
Centration	＜1′

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Biconcave Lens 25mm Diameter −24.7mm Focal Length Uncoated
SLB-25B-25N

25mm

−24.7mm

3-5 days

35,20 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25mm
Focal length f	−24.7mm
Edge thickness te	8.4mm
Center thickness tc	2mm
Back focal length fb	−25.3mm
Radius of curvature r	25.95mm
Centration	＜1′

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Biconcave Lens 50.8mm Diameter −199.5mm Focal Length Uncoated
SLB-50.8B-200N

50.8mm

−199.5mm

6-12 weeks

49,40 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ50.8mm
Focal length f	−199.5mm
Edge thickness te	6.1mm
Center thickness tc	3mm
Back focal length fb	−200.5mm
Radius of curvature r	207.6mm
Centration	＜1′

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Biconcave Lens 25mm Diameter −39.7mm Focal Length Uncoated
SLB-25B-40N

25mm

−39.7mm

3-5 days

35,20 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25mm
Focal length f	−39.7mm
Edge thickness te	5.9mm
Center thickness tc	2mm
Back focal length fb	−40.3mm
Radius of curvature r	41.52mm
Centration	＜1′

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Biconcave Lens 25mm Diameter −69.7mm Focal Length Uncoated
SLB-25B-70N

25mm

−69.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25mm
Focal length f	−69.7mm
Edge thickness te	4.2mm
Center thickness tc	2mm
Back focal length fb	−70.3mm
Radius of curvature r	72.66mm
Centration	＜1′

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Biconcave Lens 25.4mm Diameter −24.7mm Focal Length Uncoated
SLB-25.4B-25N

25.4mm

−24.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25.4mm
Focal length f	−24.7mm
Edge thickness te	8.6mm
Center thickness tc	2mm
Back focal length fb	−25.4mm
Radius of curvature r	25.95mm
Centration	＜1′

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Biconcave Lens 10mm Diameter −19.7mm Focal Length Uncoated
SLB-10B-20N

10mm

−19.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ10mm
Focal length f	−19.7mm
Edge thickness te	3.2mm
Center thickness tc	2mm
Back focal length fb	−20.3mm
Radius of curvature r	20.76mm
Centration	＜1′

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Biconcave Lens 25.4mm Diameter −49.7mm Focal Length Uncoated
SLB-25.4B-50N

25.4mm

−49.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25.4mm
Focal length f	−49.7mm
Edge thickness te	5.2mm
Center thickness tc	2mm
Back focal length fb	−50.4mm
Radius of curvature r	51.9mm
Centration	＜1′

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Biconcave Lens 10mm Diameter −39.7mm Focal Length Uncoated
SLB-10B-40N

10mm

−39.7mm

3-5 days

30,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ10mm
Focal length f	−39.7mm
Edge thickness te	2.6mm
Center thickness tc	2mm
Back focal length fb	−40.3mm
Radius of curvature r	41.52mm
Centration	＜1′

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Biconcave Lens 25.4mm Diameter −79.7mm Focal Length Uncoated
SLB-25.4B-80N

25.4mm

−79.7mm

6-12 weeks

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25.4mm
Focal length f	−79.7mm
Edge thickness te	4mm
Center thickness tc	2mm
Back focal length fb	−80.4mm
Radius of curvature r	83.04mm
Centration	＜1′

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Biconcave Lens 12.7mm Diameter −14.7mm Focal Length Uncoated
SLB-12.7B-15N

12.7mm

−14.7mm

3-5 days

29,60 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ12.7mm
Focal length f	−14.7mm
Edge thickness te	4.7mm
Center thickness tc	2mm
Back focal length fb	−15.3mm
Radius of curvature r	15.57mm
Centration	＜1′

i

Biconcave Lens 25.4mm Diameter −199.7mm Focal Length Uncoated
SLB-25.4B-200N

25.4mm

−199.7mm

3-5 days

33,90 €

Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Uncoated
Clear aperture	90% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	Uncoated
Diameter φD	φ25.4mm
Focal length f	−199.7mm
Edge thickness te	2.8mm
Center thickness tc	2mm
Back focal length fb	−200.4mm
Radius of curvature r	207.6mm
Centration	＜1′

N-BK7, BiConcave Lenses (Uncoated)

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