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Old 29-11-2020, 09:40 PM
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Camelopardalis (Dunk)
Drifting from the pole

Camelopardalis is offline
 
Join Date: Feb 2013
Location: Brisbane
Posts: 5,239
It’s because you don’t want the filter to be an obstruction and cut into the light cone. 1.25” filters have clear aperture of about 28.5mm, so you’ve not got a lot to play with when using a sensor size like the 294.
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