What can your sensor see?
Enter your telescope, camera, and optional target size to find out how much sky fits in your frame.
Inputs
1 = none, <1 = reducer, >1 = Barlow
Leave blank to skip target fit check
Results
Adjust the inputs to see results.
Small-angle approximation (Huygens formula): FOV = 57.296 × sensor size / focal length
All formulas verified by automated tests.