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Originally Posted by janoskiss
Well, 68 degrees is 30% more than 52 degrees. So 5 seconds will become 5x1.3 = 6.5 seconds for the same focal length. If you go from 10mm to 13mm, then that's another 30%, so that's 8.5 seconds. You better have hot water and teabag ready to go before you start making that cuppa!
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Well ok, it doesn't take that long but I can easily centre an object, go back to my observation table and make a few notes, come back and find the object still in the FOV. With my 12.5mm plossl this was unthinkable. And I'm working with a mag of 115.
I think a 65~68° FOV will be good for most observers. Though I haven't observed with a nagler or UWA or UWAN yet I think 68° will be a nice thing to start with.