Complaint
The plano-concave lens converts a beam of parallel light into divergent light rays, and the divergent light rays are reversely focused on the virtual focal point of the plano-concave lens. The focal length is negative, and one side is flat and the other is concave. Plano-concave lenses diverge a collimated beam of light from a virtual focal point and are commonly used in Galilean-type beam expanders. In use, the concave side faces the direction of the incident light and the flat side faces the focal plane to be processed. Plano-concave lenses have negative focal lengths and negative spherical aberration, which can be used to cancel out the aberrations of other lenses in the system.
| Diamenter(mm) | Focusing Length(mm) | Black Focusing Length(mm) | Center Thickness(mm) | Edge Thickness(mm) | Redius Curvature(mm) |
| 9.0 | -27.0 | -28.3 | 2.0 | 2.7 | -13.9 |
| 12.7 | -25.0 | -27.0 | 3.0 | 4.7 | -12.9 |
| 12.7 | -30.0 | -32.0 | 3.0 | 4.4 | -15.4 |
| 12.7 | -50.0 | -52.3 | 3.5 | 4.3 | -25.7 |
| 25.0 | -75.0 | -77.3 | 3.5 | 5.6 | -38.6 |
| 25.4 | -50.0 | -52.3 | 3.5 | 6.9 | -25.7 |
| 25.4 | -75.0 | -77.3 | 3.5 | 5.6 | -38.6 |
| 25.4 | -100.0 | -102.6 | 4.0 | 5.6 | -51.5 |
| 50.8 | -100.0 | -102.6 | 4.0 | 10.7 | -51.5 |
| 25.0 | -150.0 | -125.6 | 4.0 | 8.3 | -77.2 |
Negative lens, Imaging lens, Beam expander lens, Beam reducer lens, Beam collimating lens, Diverging collimated beam, Collimated diverging beam, Telescope, Nearsighted lens, Camera lens, Microscope, Magnifying glass, Light receiver and condenser lens Etc.
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