Plano Concave Lenses
Tower Optical’s plano concave lenses have a negative focal length, diverge collimated incident light, and form only virtual images which are seen through the lens. They are often used to expand light beams or increase focal lengths in existing systems. They are widely used in telescopes, collimators, optical transceivers, magnifiers, radiometers and condensers.
Specifications
| Material : BK7, grade A, fine anneal, or K9 substitute |
| Design wavelength: 632.8 nm |
| Diameter tolerance: +0/-0.10 mm |
| Focal length tolerance: ±1% |
| Centering: ±3 arc minutes |
| Clear aperture: 90% of diameter |
| Surface quality: 60-40 Scratch-Dig |
| Bevel: 0.25 mm x 45° |
| Coating: none |
Call for a custom quote
| Part No. Number | Dia.(mm) | EFL (mm) | R1 (mm) | R2 (mm) | CT (mm) | ET (mm) | BFL (mm) | |
| LNCV001 | 6 | -18 | -9.26 | ∞ | 2 | 2.5 | -19.32 | |
| LNCV002 | 6 | -24 | -12.35 | ∞ | 2 | 2.37 | -25.32 | |
| LNCV003 | 12.7 | -25 | -12.87 | ∞ | 3 | 4.68 | -26.98 | |
| LNCV004 | 12.7 | -30 | -15.44 | ∞ | 3 | 4.37 | -31.98 | |
| LNCV005 | 12.7 | -50 | -25.73 | ∞ | 3.5 | 4.3 | -52.31 | |
| LNCV006 | 25.4 | -50 | -25.7 | ∞ | 3.5 | 6.9 | -52.3 | |
| LNCV007 | 25.4 | -75 | -38.6 | ∞ | 3.5 | 5.56 | -77.31 | |
| LNCV008 | 25.4 | -100 | -51.46 | ∞ | 4 | 5.59 | -102.64 | |
| LNCV009 | 50.8 | -75 | -38.6 | ∞ | 3.5 | 13.04 | -77.31 | |
| LNCV010 | 50.8 | -100 | -51.46 | ∞ | 4 | 10.71 | -102.64 | |
| LNCV011 | 50.8 | -150 | -77.19 | ∞ | 4 | 8.3 | -31.97 |
Please check with Tower for availability. Call us for quantity pricing.
We make custom versions of everything on this site. Send us your drawings or specifications and we will provide a quotation.