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The key thing about shooting in the near infrared is the reduced turbulence, which enables you to get more accurate guiding. The ONAG is great because (a) you're guiding in the near infrared, (b) no flex and (c) full FOV.
Since the ONAG is out of my budget at the moment, I've just recently bought an IR-pass which I plan to use in conjunction with an OAG and the QHY5L-II. I think it's still going to be a few weeks before that gets here, but I'll post my findings when I do.
Edit: Back on topic.
I've only ever used 2x2 binning a couple of times on the QHY5L-II and I can't really remember my motivation to be honest. I'd only ever think to do it now if I couldn't find a star with 1x1. Whatever you do, make sure your software detects the new effective pixel size properly, or you update it... I forgot to set mine back initially and was like "wow! This is the best guiding I've ever seen!" I was a bit disappointed with the results ;-)
Last edited by codemonkey; 14-08-2015 at 06:58 PM.
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