A negative lens with the form most suitable where one conjugate is more than five times the other, e.g. producing divergent light from a collimated input beam.
|
Material |
BK7 (Or Fused Silica) |
|
Design Wavelength |
546.1nm (632.8 nm for Cylindrical lenses ) |
|
Design Index |
1.5183 ±0.0005 (1.5147 for Cylindrical lenses) |
|
Flatness |
l/4@632.8nm (x |
|
Diameter Tolerance |
+0.0, -0.15mm |
|
Paraxial Focal Length |
±2% |
|
Center Tolerance |
3 arc minutes |
|
Clear Aperture |
>80% |
|
Surface Quality |
60-40 scratch and dig |
|
Bevel |
0.25 mm x 45° |
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