Quote:
Originally Posted by gbeal
Doesn't look all that severe though Dennis. I have the same reducer/flattener, but always understood it's prime function in life was to sort the under 800mm focal length refractor problems. Here the scope is way over this and also not even made in the same country, not pushing it a bit are you, LOL.
Gary
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Hi Gary
I have the ridgy didge Tak x0.8 Reducer/Flattener, which reduces the M180 from F12 (2160mm) to F9.6 (1728mm), which I reckon can do a better job than my set up and technique has produced.
Pierre put me onto the required spacing of 56mm which is something I need to check. Also, when I looked at my 60 sec and 30 sec exposures, I didn’t see any (as much?) evidence of the flaring, so I’m going to investigate further to check for flexure in my side by side set up. I have a lot of overhang even though the plate and fittings are very substantial and stiff.
Quote:
Originally Posted by atalas
Good work with such a long focal length Dennis....spacing reducers/flatteners is a pain and It seems that you can never get It right till you stick you hand in your pocket and fork out for the right parts . (Tak)
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Hi Louie
Yep = you’re dead right; you need to be faithful to the Tak design and adapters – something that I’m learning the hard (and expensive!) way.
Cheers
Dennis