Svbony SV220 2" Dual Band 7nm HA & OIII Filter - W9172B

Svbony Dual-Band 7nm H-Alpha/OIII 2" Filter

This Svbony H-Alpha/OIII 7nm Narrowband Filter is designed for astrophotography in dark skies as well as a light polluted environment. Take color images without the need for separate Oxygen III and H-Alpha filters. The Dual-Band Filter is useful for imaging emission nebulae, planetary nebulae and supernova remnants. It will also sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow...and even moonlight...drastically reducing the effects of natural and artificial light pollution.

The 7nm bandwidth strongly isolates red (H-alpha) and green/blue (OIII) emissions while blocking light pollution.  This maximizes the nebula's signal and darkens the background sky at the same time.

Note:  This filter is designed for focal ratios of f/5 and slower.  

Connection Chart: 

Specifications

• Brand:  Svbony

• Model: SV220

• Name:  Duo-Band OSC Filter

• Size:  2"

• Substrate Thickness:  1.80mm

• Clear Aperture:  44 mm

• Wavelength Range:  300 - 1100 nm

• FWHM:  OIII (7nm), H-Alpha (7nm)

• Blocking:  OD5

• Peak transmittance:  500.7m@T> 90%; 656.3m@T>94%

• Surface quality:60/40

• Surface parallelism:  1/4A

• Thread:  M48x0.75

• Single Thread:  Yes

• Net Weight:  12.5g / 0.44oz /0.027lb