SV132 H-Beta 25nm 1,25 inch filter to reduce light pollution

• Designed to observe the Horsehead, California, and Cocoon nebulas with a moderately large aperture telescope in dark skies.
• High-precision optical polishing on both sides; the filter substrate is polished to 1/4 wave and <30 flatness on both surfaces, eliminating halos.

High-precision optical coatings enhance transmission and cut-off depth; they provide superior transmission above 90% and completely reject stray light.

The high transmission of the bandwidth and the optical density of the stopband are ensured by the planetary rotation system, a homogeneous and precise coating process; The high optical quality of the SV132 filters ensures no loss of sharpness or contrast.

• Filter with metal mount threaded 1.25 inches; Threaded to fit 1.25 inch eyepieces and threaded diagonal barrels.