Theory

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 …

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How to Interpret an Image Histogram

The histogram is probably the most important tool available in any astro-imaging application, both for capturing images and for processing them once captured. For those just starting out in astrophotography, the histogram is also one of the simplest but most frequently misunderstood tools. In this short guide will explain the histogram; both what it means and …

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