If you are using a 2021 FOV calculator today, you are part of a pivotal era in amateur astronomy—the moment when sensor noise dropped, spreadsheet planning died, and visual simulation reigned supreme.
Many astrophotographers buy used gear from 2019-2021. If you own a ZWO ASI 071 (released 2018, popular in 2021) or a Meade LX85 (common in 2021 catalogs), modern calculators might have dropped support for these older drivers. The 2021 tools still work perfectly with that vintage. astro fov calculator 2021
[ \text{FOV (degrees)} = \frac{\text{Sensor Dimension (mm)} \times 57.3}{\text{Focal Length (mm)}} ] If you are using a 2021 FOV calculator
Do you still use a 2021 setup? Share your gear specs and FOV screenshots in the comments below. spreadsheet planning died