eyepiece field stop and aFOV

Asked by ernest watts

I need to find out what the aFOV for my celestron 20mm erecting eyepiece, celestron 15mm, elestron 9mm, and elestron 4mm eyepieces also the field stop so I can setup my telescope in stellarium.

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Stellarium Edit question
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Alexander Wolf (alexwolf) said :
#1

Are you tried use official specification from manufacturer? For example: https://www.celestron.com/products/omni-15-mm-eyepiece

Hint 1: aFOV = Apparent Field of View

Hint 2: Do not fill "stop field" if this data do not used in specification

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