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Yes, purely for visual.
I just drew the 1200mm triangle on the floor and my internal aparture of 50mm is 720 mm from objective so no issues with the new focusser cutting down light.
Sometimes you just need to verbalise or, in this case, write things down for it all to become clear.
My hexafoc is damaged and this new Bintel Crayford style was one of the very few options available without selling a kidney, noting l still have to get an adaptor made up.
Thanks for the confirmation on FL Glen, sets my mind (and wallet) at ease. I've done a LOT of googling trying to figure this one out.
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