Affordable fast Newtonian astrographs are game changers for astrophotographers. Most of these instruments have a focal ratio in the vicinity of f/4, allowing them to capture light from deep-sky ...

Astrophotography has shifted from a niche pursuit to a mainstream hobby, and the telescope you choose now matters as much as the camera you bolt onto it. The best instruments balance sharp optics, ...

The Part 1 of this series about digital camera design has shown how to do the basic calculations that interrelate pixel size, focal length, focal ratio, and spot size, and demonstrated how these ...