Quote:
Originally Posted by h0ughy
|
David - it could be - I think there were some good reports of the Falt 4 with APOs and in particular 127mm units but I also think the FLAT4 is expensive and has been reported as not acting as an FR (if that is what you want) - or at least my memory tells me that - and I think there have been two versions produced just to confuse further.
I have also heard recommend the HOTECH unit:
http://www.hotechusa.com/category-s/4.htm
Again not an FR though.
In my case I want an FR more than flattening as I have a small CCD but to date I have not been able to find one that I can use with my setup of 127 - OAG - 1.25" FW - CCD.
This area really does seem to be a black art - even when I had my VC200L which had a custom made corrector and FR the FR made the images soft and the native fl made the fov samm and the res too high with a DSLR though the field was flat...
I guess the best is to match the CCD to the optic and let the tube do its thing at its designed fl if you can - of course that might mean you need more than one scope...