Drum Ball Lenses from Knight Optical
A drum lens is a slight adaptation of the normal ball lens. The only difference is that a ball lens is ground down on a specific side to flatten it out. Features,
- Cylindrical sides with convex curvatures
- Typical ball lens performance
They are available in optical glass, ruby and sapphire (link to material technical data.).
All drum lenses can have an Anti-Reflective (AR) Coating applied.
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