Pentax 55mm Lens @f/5.6 Atik 383L+ Mono Camera Atik EFW2 Filter Wheel
Astrodon 5nm Ha filters Losmandy G11
This is the first image with an old, inexpensive 55mm manual focus SLR lens made by Asahi for Pentax. I set the aperture to f/5.6 because any faster and the stars started to distort. Despite the old glass and some curvature in the corners, I was pleasantly surprised at the quality. With my camera, this lens yeilds a 14x18 degree FOV!