Filters
Color Glass and Absorptive Neutral- Density filters
Filter Glass
We maintain no less than two hundred 6.5" filter blanks in inventory. This way Dell Optics can offer our customers a wide selection of any shape and size to meet your specifications.
Clear Aperture: > 90%
Figure: < 2 Fringes
Scratch/Dig: 60/40
Parallelism: < 3 Arc Minutes
Absorptive Neutral-Densities
Made from Schotts NG series Color Glass, Dell Optics can supply individual or complete sets from .1 to 5. Optical Densities. Please keep in mind that thicknesses vary because of the variation in the
melts
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Diameter: 25.0 +/- .1mm Square: 50.8 +/- .1mm Clear Aperture: > 90% Scratch/Dig: 60/40 Parrallelism: < 3 Arc - Minutes Edges Fine Ground and Beveled 45 degrees typical
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