Quote:
Originally Posted by HarryD
The QSI site gives a distance of 50.292mm for the 683wsg-8.
The WO site gives different distances for various telescopes eg for the FLT132 it's 71.5mm.
So 71.5mm - 50.292mm = 21.208mm.
For a FLT110 it's 73.5, so 23.208mm spacer.
If WO has recommended distances it would be wise to use their recommendation as a starting point.
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Agreed. My recommendation was based on the former stated back focus of 55mm. Starting with the flattener/reducer back focus distance and then subtracting the QSI back focus distance will get you spot on for what adapter length you need.