Astro+fov+calculator+hot //top\\ Jun 2026

Originally for CCD cameras, but updated for modern CMOS sensors. It is less pretty than Astronomy.tools , but it is because it calculates thermal drift – how long until your sensor overheats and needs a cooling cycle.

A warm scope in cold air creates internal convection currents that blur stars, effectively reducing usable resolution and shrinking your “effective FOV” for fine detail. Modern FOV tools highlight this by offering “seeing-limited” overlay modes—showing what your sensor actually records, not what optics theoretically deliver. astro+fov+calculator+hot