Post is this filter any good
Astronomik H-Alpha 12nm CCD Filter - T Threads
- The Astronomik H-Alpha 12nm Filter has T-threads on both sides, allowing you to attach it to a T-adapter, etc. and still present a T-thread on the other side.
- The Astronomik H-Alpha 12nm Filter has a transmission of up to 99%.
- The full width at half-maximum (FWHM) of 12nm is optimized for the use with common CCD cameras and allows the use of very fast optics.
- The Astronomik H-Alpha Filter may NOT be used for solar observation.
Astronomik H-Alpha 12nm CCD Filter - T Threads
The Astronomik H-alpha filter is a narrow band filter for CCD photography. The filter lets the H-alpha light of emission nebulae pass and blocks nearly the whole remainder of the spectrum where the CCD is sensitive.
The full width at half-maximum (FWHM) of 12nm is optimized for the use with common CCD cameras and allows the use of very fast optics. It should be noted that the filter has a transmission of up to 99%. Another advantage of the 12nm filters is the availability of guiding stars for cameras with a built-in-autoguider (SBIG). If you use a very strong filter like our 6nm filter you often won’t find a usable guidestar.