Tim Schaeffer Posted March 18 Report Share Posted March 18 Hello, I wanted to ask what the recommended Backfocus for my 8" f/4 scope (native) with the ASA 0.73x reducer is - I don't find documentation for this on any of the pdfs/drawings. Doesn't it perfrom well with a 8" or what's the reasoning behind this? I can get down to an absolute minimum of 66.3mm which I fear is too much (basing on numbers for a f/3.8 system and different mirror sizes). Filters would add 0.7mm to the BF of the reducer. Any help is much appreciated! Best, Tim Link to comment Share on other sites More sharing options...
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