23 Apr 2010 FOCtek offers high quality Filter include: Colored Glass Filter, Interference Filter, Neutral Density Filter, Dielectric Coating Filter, Lyot Filter and so on. Specifications of Colored Glass Filter:
Material: colored glass filter
Dimension Tolerance (mm): +0.0/-0.2 (General), +0.0/-0.05 (High Precision)
Thickness Tolerance (mm) :±0.2 (General), ±0.05 (High Precision)
Clear Aperture: >80% (Small Size), >95% (Large Size)
Parallelism: 1 min. (General), 3 sec. (High Precision)
Surface Quality: 60/40 (General), 10/5 (High Precision)
Flatness (per 25mm@633nm) :λ (General), λ/10 (High Precision)
Bevel (face width x 45。) :<0.25mm
Coating :Uncoated, Dielectric AR Coating, Dichroic Filter Coating, etc.
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