| Lens |
Material |
Illustration |
Property & Application
|
| Plano-
Convex |
BK7
Fused Silica
Sapphire
CaF2 |
 |
Positive focus length. Most suitable
where one
conjugate is more than five times the other, e.g. in
sensor application or for use with near collimated light.
Also where both conjugates are on the same side of
the lens, e.g. as an add-on lens to increase the
numerical aperture. |
| Double-Convex |
BK7 Fused Silica |
 |
Most suitable where the conjugates
are on opposite
sides of the lenses and the ratio of the distances is
less than 5:1, e.g. as simple image relay components. |
| Plano-Concave |
BK7
Fused Silica Sapphire
CaF2 |
 |
Negative lens with the form most suitable
where one
conjugates is more than five times the other, e.g.
producing divergent light from a collimated input beam. |
| Double-Concave |
BK7
Fused Silica |
 |
Negative lens with the form most suited
to producing
diverging light or a virtual image, where the input light is
converging. |
| Meniscus |
BK7 Positive |
 |
These lenses may be used to increase
the numerical
aperture of a positive lens assembly, without an undue
increase in the aberrations. |
| BK7 Negative |
 |
The best lens form where one conjugates
is relatively
far from the lens or where both conjugates are the
same size of the lens. |
| Cylindrical |
BK7
Fused Silica |
 |
Used to provide focusing power in
one section only.
For illumination or detection of light from line sources.
Also used to anamorphic compression of beams and
images. |
| Achromatic |
Combinations of Two
Optical Grade
Glasses |
 |
These lenses have considerably reduced
values of
spherical aberration. Coma and chromatic aberration.
Best used to replace single components where
performance must be improved. |
Ring
Mount for
Lens |
Black Anodized
Aluminum |
 |
Used to fix position of lenses.
|
