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Old 21-03-2018, 09:54 AM
glend (Glen)
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glend is offline
Join Date: Jun 2013
Location: Lake Macquarie
Posts: 5,731
Wide field coverage refractor?

I need some help with field of view coverage. I am looking for a small refractor that can give me good wide field (4 degrees Az x 3 degrees Alt) for a particular faint target i am chasing. I have tried using my 80mm APO reduced to 442mm fl but the field is too large. I am thinking that something around 320mm fl might work ok. Can any of you math wizards point me to a FOV calculator that an idiot like me can use?
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