Biconcave Lens 50.8mm Diameter −249.5mm Focal Length 400 - 700nm
SLB-50.8B-250NM
These biconcave lenses are used when a very high negative power is required. They can be used in a multi-element system or alone to produce a diverging cone or virtual image. Sharpe edges, which are common in negative lenses, are removed by beveling to reduce the likelihood of chipping.
◦There are two types of biconvex lenses available; BK7 for use in visible range to infrared wavelength range.
◦Our lenses are listed by outside diameter and focal length to assist your selection according to required specifications.
◦Our lenses are listed by outside diameter and focal length to assist your selection according to required specifications.
| Name | Biconcave Lens 50.8mm Diameter −249.5mm Focal Length 400 - 700nm |
|---|---|
| Weight | 0.0500kgs |
| Standard Coatings Available | No |
| Guide |
|
| Remark | - |
| Attention |
|
| Diameter φD | 50.8mm |
| Focal length | −249.5mm |
| Material | BK7 |
| Design Wavelength | 546.1nm |
| Refractive index n<sub>e</sub> | 1.519 |
| Coating | Broadband Multilayer antireflection coating (400 - 700nm) |
| Transmmittance | > Average 99% |
| Laser Damage Threshold | 4J/cm2 (Laser pulse width ; 10ns , Repetition frequency ; 20Hz) |
| Clear aperture | 85% of the diameter |
| Surface Quality (Scratch-Dig) | 20-10 |
| Wavelength range of Antireflection Coating | 400 - 700nm |
| 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′ |
In stock
SKU
SLB-50.8B-250NM
$141.00
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These biconcave lenses are used when a very high negative power is required. They can be used in a multi-element system or alone to produce a diverging cone or virtual image. Sharpe edges, which are common in negative lenses, are removed by beveling to reduce the likelihood of chipping.
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