Has anyone tried one of these
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.