Thursday, 16 October 2014

Basics Part 1: Understanding Aperture, Focal Length and Focal Ratios

Questions about the best choice of equipment for astro-imaging come up quite frequently. In this first of a series of posts, I will start by explaining the basics of aperture, focal length focal ratios. 

These troublesome topics cause many beginning imagers to jump to mistaken conclusions. If you bear with me you'll find out how they (and other things) affect imaging and consequently you will be able to make better informed choices about your equipment. Read on for more...