Quote:
Originally Posted by Camelopardalis
It’s kind of a “suck it and see” experiment…at f/4 the critical focus zone is quite slim, and on a decent night your Quattro should give you quite tight stars (when collimated!)
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Thanks Everyone,
Here is last nights second effort with the new Quattro on NGC 1532. The stars are a little better but are elongated by some red CA. I still can't get the focus below 5.3 FWHM. Perhaps I need to try adjusting the back focus slightly? Other options (apart from fine tuning the collimation again) are to change the filter wheel to a filter drawer to reduce weight on the focuser ( it's a low profile R&P focuser).
Chris