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GT71 with Flat6A… Settings for 2600mm Pro with 2” Filter Wheel?


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I’m just about to take delivery of a William Optics GT71 and Flat6A iii 0.8 Reducer…

The plan is to attach my 2600mm Pro, a 16.5mm Adapter, M54M-M48F adapter and 2” EFW giving a total spacing of 56mm (as per ZWO guidance)…

Has anyone used this combination and, if so, what setting did you end up with on the adjustable Flat6A iii?

Also, where did the focusing tube roughly end up for focus?

I know I’ll have to spend some time on the next clear night to get it perfectly sorted out but just wondered about a ‘starting position’…

Many Thanks

Olly

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