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ATM Buddy

Coma-free radius calculator

Coma-free field diameter (mm) = 0.022 * (f/D)³

Create optical pieces in the Hardware tab to quickly load their dimensions here.

Focal ratio: f/4.00

Coma-free field (linear): 1.408 mm

Coma-free field (apparent): 0.0672°

Coma-free in eyepiece: 8.1° of 82° AFOV

Diameter (mm):

Focal length (mm):

Eyepiece focal length (mm):

Eyepiece AFOV (°):

A project by Lucas Sifoni, Paul Faÿs from Gallifrey Optics, and Raphaël Labro from La3emedim.fr
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