Lenses
Positive meniscus lenses
Positive meniscus lenses may be used to increase the numerical aperture of apositive lens assembly, without an undue increase in the aberrations. Pictures and drawings of Positive meniscus lenses: ..

Positive meniscus lenses may be used to increase the numerical aperture of apositive lens assembly, without an undue increase in the aberrations.
Material: | BK7, Fused Silica, SF10, CaF2, Sapphire .etc. |
Paraxial Focal Length Tolerance: | ±2% |
Dimension Tolerance: | ±0.2(General). ±0.05(High Precision) |
Centration: | <3 arc min |
IRR: | λ/4@633nm(General),λ/10@633nm(High Precision) |
Clear Aperture: | >80%(Small Size), >95%(Laege Size) |
Surface Figure: | <1.5λ@633nm(General),<λ/4@633nm(High Precision) |
Surface Quality: | 60/40(General),10/5(High Precision) |
Bevel: | <0.25mm |
Coating: | Uncaoted, AR,PR, HR, etc. |