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Elliot
Yes I cropped the top 5% , sides 2% and bottom 1% for stacking artifacts and centering the main Nebula
Basic FOV calc
Sensor size of camera chip mm x 3460 / focal length
Use formula for both height and width
FOV in arc minutes
An 8”f4 has a focal length of 800mm, so depends on your cameras sensor size
My canon 600D has an APS-C crop sensor at 22.3 x 14.9mm
Cheers
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