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Yes this is a really useful thread, dare I say 'award winning! 😁
I've heard from one technical expert how bad Orion Optics can be, having to recoat a new expensive mirror! And another industry supplier saying pretty disappointing things about their tactics. Just rumour of course, but enough for me to be glad I've never used them.
At these longer focal lengths, once off focusing at start is not possible. Temp changes cause the focus point to vary too much
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