Astro Fov Calculator

A visual simulation appeared on his screen. A red rectangle—representing his sensor—was perfectly superimposed over a glowing image of the Whirlpool Galaxy.

If a target is too large for your sensor, you may decide to shoot a mosaic (stitching multiple images together). An Astro FOV calculator allows you to calculate the overlap percentages required (usually 15-20%) to ensure seamless stitching in post-processing software. astro fov calculator

Conversely, you try to observe the Ring Nebula (M57) with a 40mm eyepiece. It looks like a tiny, dim donut you can barely see. You need more magnification, but you don't know how much. A visual simulation appeared on his screen