Feature(may vary by option.)

●*(Dual Band Ha 7nm & OIII 7nm Filter) 7nm dual band filters are designed to significantly reduce the effects of light pollution, and are used for imaging bright ray nebula, planetary nebula, and supernova debris
●*(Dual Band 7nm Filter) 7nm bandwidth strongly separates H-Alpha (red) and OIII (patina blue) radiation from other objects to ensure that the captured celestial objects are pure enough. Spectrum interference outside of target
●(Significantly Reduces Light Damage and Moonlight) The filter greatly reduces the effects of light pollution and moonlight, allowing you to take photos even in light hazardous environments such as verandas and backyards. At the same time, it also saves time and fuel costs
●* (Simplified Shooting and Post Processing) Compared to traditional DSO shooting methods and long single channel exposure time and post processing, the dual band filter simplifies boring and difficult shooting and post-processing and get full color. Image once

[SV220 2 inch]

Description

Brightness: 44mm
Filter Type: Dual Band OSC Filter
Thickness: 1.80mm
Surface Quality: 60/40
Dimensions: 2" (50.8mm)
Type: Dual Band Filter
Place of Origin: China mainland
Board Thickness: 0.07 inches (1.80 mm)
Wavelength Range: 300-1100 nm
Hooam OIII (7nm) & HA (7nm)
Block the North Star
Peak Transmittance: 500.7nm@T>90%; 656.3nm@T>94%
Wire: M48x0.75
Single Thread: Yes
Net Weight: 12.5g/0.44oz/0.027lb