SV132 H-Beta 25nm 1.25 inch filter to reduce light pollution

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

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

The high transmission of the bandwidth and the optical density of the stop band 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 a metal mount with 1.25-inch threading; Threaded to fit 1.25-inch eyepieces and threaded diagonal barrels.