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slightly off topic, I plan to get an OIII filter as well to use with my 8" F4 scope, but am stuck between choosing a 1.25" and 2" EP, both 68deg AFOV.
A 20mm 1.25 GSO superview EP or a 30mm 2" GSO superview. Not sure of the numbers, but the 20mm would provide reasonably better sized objects than the 30mm as the scope is only an F4 and as its 68deg, should be comfortable enough for viewing.
The 2" would be far better and you wouldn't have to shift your eye to cover the whole FOV, but then objects would be smaller.
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