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> Optical filter, 565ALPHA longpass, 18MM diameter
Optical filter, 565ALPHA longpass, 18MM diameter
Optical Filter, 565 Longpass with ALPHA slope. Supplied in a 18mm diameter X 3.75mm thick metal ring. Blocking >OD5 at 532nm. Parts are polished to provide high parallelism and minimal wavefront distortion, also have A-R coatings.
Alpha slope provides very sharp cut-on. Transmission region for this LP filter is fairly short, cut-off about 730nm with harmonic oscillation commencing about 845nm.
