Astronomik CLS Clip-Filter Sony Alpha 7
Almost brand new for sale. Made in Germany The Astronomik CLS blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass. All the important emission lines, as well as the spectral region that the very well dark adapted eye can see, can pass through the filter. Technical Data 92% transmission at 486nm (H-beta) 92% transmission at 496nm (OIII) 92% transmission at 501nm (OIII) 97% transmission at 656nm (H al