Optolong Night Sky H-Alpha IR650 Filter 2″

1.  Optolong Night Sky H-Alpha Introduction

Night Sky H-Alpha filter (IR Pass 650nm) with 50% transition from blocking to passing at about 640nm and 95% or above transmission at wavelengths longer than 650nm can be used in IR-LRGB imaging to produce a sharper luminance image for the best planetary contrast as atmospheric seeing and distortion is much reduced at longer IR wavelengths.

Main Use

The sensor of CCD or CMOS cameras is capable of detecting light in the 350-1100nm range including infrared wavelengths. Thus RGB planetary images taken with IR as the luminance channel have visible-enhanced contrast and surface detail than standard LRGB images.

WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.

2. Optolong Night Sky H-Alpha Spectrum and Characteristic
Sbustrate: Optical glass
Thickness: 1.85mm
Tave:  T>90%
Blocking range: 300-570nm
Surface quality: 60/40
Transmitted Wavefro