Plano Concave Lenses
Tower Optical’s plano concave lenses have a negative focal length, diverge collimated incident light, and form only virtual images which are seen through the lens. They are often used to expand light beams or increase focal lengths in existing systems. They are widely used in telescopes, collimators, optical transceivers, magnifiers, radiometers and condensers.
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Specifications
Material: BK7, grade A, fine anneal, or K9 substitute
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| Design wavelength: 632.8 nm |
| Diameter tolerance: +0/-0.10 mm |
| Focal length tolerance: ±1% |
| Centering: ±3 arc minutes |
| Clear aperture: 90% of diameter |
| Surface quality: 60-40 Scratch-Dig |
| Bevel: 0.25 mm x 45° |
| Coating: none |
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