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Hi Dunk,
Indeed I do. I found one on Amazon that is 27.6 mm in depth. The OAG has a 42 mm thread like most optics and I kept looking for a 48 mm thread when I didn't need to.
The measurement is now:
18 mm (flange depth) + 27.6 mm (T Mount) + 16.5 mm (OAG) = 62.1 mm. As the Flat 61A has that 12.9 mm that can be reduced, I will have to change that adjustable Flat 61A measurement to give that magical 67.7 mm that the Flat 61A wants to use.
William Optics don't do themselves any favours with the documentation. They INSIST on the 55 mm back focus AND the 12.9 mm set distance on the Flat 61A. Simple addition means that 55 and 12.9 does not equal 67.7. Perhaps 0.2 of a mm is not worth the effort to adjust.
All I can say is that with a fixed depth Flat 61, getting exact distance would be a pain. It helps to discuss these issues as it clears your head.
Now for some nights without this damn smoke and/or wind.
Thanks again,
Stephen
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