The SBIG CFW-402 is an internal filter wheel for the SBIG ST-402ME CCD camera. It contains custom RGB+C color filters for RGB or CRGB color imaging with the ST-402ME. The filters are multi-layer vacuum-deposited dichroic interference-type filters, rather than simple dyed glass. The filter wheel drops into the ST-402ME camera body after removing the front cover (a matter of only a few moments undoing four fasteners on the camera front plate).
The CFW-402 filter wheel uses the same custom designed high quality dichroic filters that SBIG developed for the ST-7/8/9/10 “E” and “ME” cameras. The filters are designed to yield a proper balance of both OIII and H-alpha planetary nebula emission line intensity while at the same time giving an accurate white balance of continuum light from solar type stars in the same field.
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