Positive cylinders have one flat surface and one convex surface.
Below are our standard positive cylinder specifications.
Don't see what you need? Request custom optics.
| Lens Type | Positive Cylinder | Length Tolerance | ± 0.10 mm | |
| Glass Type | N-BK7 | Width Tolerance | ± 0.14 mm | |
| Dimension Unit | mm | Center Thickness | ± 0.50 mm | |
| Focal Length | ± 2% | Surface Quality | 60-40 | |
| Surface Accuracy | Y-Direction X-Direction |
1/2 Wave | Centration | < 3 arc minutes |
| 1/2 Wave per 25 mm | Clear Aperture | 90% | ||
| Coating | Uncoated, Specify your coating (See Coating Chart for Available Options) | |||
| * All dimensions are in mm | ||||