FLI Research Grade Filters

Our high transmission filters are manufactured in the United States with the highest quality fabrication techniques available. We offer a full line of filter types and sizes. Complete sets are available as well as individual filters in both round and square shapes.

Features:

AR: Durable AR coatings on both exterior surfaces over applicable transmission range

Scratch Dig: 60/40 or better (max scratch width 0.006mm, max dig 0.40mm)

Transmitted wavefront @ 633nm: Better than 0.25 wave/inch

Wedge: Better than 30 arcsec

Thickness: 5 +/- 0.05mm, par focal +/- 0.2mm, (filters start par focal +/- 0.1mm per recipe)

RG 28D LRGB

RG 28D UBVRI

RG 50D C

RG 50D Hα

RG 50D Hα

RG 50D Hβ

RG 50D L

RG 50D LRGB

RG 50D LRGB Hα

RG 50D LRGB Hα

RG 50D O III

RG 50D S II

RG 50D UBVRI

RG 50S C

RG 50S Hα

RG 50S Hα

RG 50S Hβ

RG 50S L

RG 50S LRGB

RG 50S LRGB Hα

RG 50S LRGB Hα

RG 50S O III

RG 50S S II

RG 50S UBVRI