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Originally Posted by cjmarsh81
The biggest I have seen is 52deg in my 10mm Plossl. That is atrocious and I do not believe it is really 52deg. Saturn will pass from one edge of the FOV to the other in approx 5 seconds.
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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!