POSITIVE MENISCUS, NEGATIVE MENISCUS
Positive meniscus lenses are designed to minimize spherical aberration
and are usually used in small fnumber applications (f # <2.5). For 2.5
f #<10, meniscus lenses can also improve image quality and reduce spot
size.
Negative Meniscus lenses are offered as an alternative to other negative
lenses and are particularly appropriate for the high index IR materials.
They are commonly used in beam expanding applications where minimal
spherical aberration is desired.
RMI Meniscus Lenses are designed to customers requirements.
Both sides can be coated with an RMI high efficiency narrowband, anti-reflective
coating.
RMI STANDARD
SPECIFICATIONS
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| Materials: |
BK7, UVFS(mm) CaF2, ZnSe, Ge(inches) |
| Surface Figure: |
BBK7, UVFS λ/10 at 632nm, CaF2, ZnSe, Ge λ/40 @ 10.6um
|
| Surface Quality: |
BK7, UVFS-10/5, CaF2-20/10, ZnSe,Ge-40/20 |
| Diameter Tolerance: |
+ 0.000", – 0.010" |
| Thickness Tolerance: |
± 0.010" |
Focal Length
Tolerance: |
± 0.5% |
| Centration Error: |
< 3 arc minutes |
| Bevels: |
0.010" – 0.030" at 45º |
| Clear Aperture: |
Central 85% of diameter |
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Last Updated ( Tuesday, 24 April 2007 )
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