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Hmm... not sure why the prism would need to be any further away than usual? Either way, it's pie in the sky, I'm not going to make one so unless someone else does...
Interesting point about the guide cam. I don't think there's much out there that beats the QHY5L-IIM. Peak QE is about bang on compared to the Lodestar, the latter of which seems to get most of the benefit from having bigger pixels, but since you can bin the QHY, I'm not sure how much better it truly is. I did find a thread by the guy that makes Metaguide on Cloudy Nights where he normalised some values in comparing the two (image analysis, not just specs) and found the QHY to be, sensitivity-wise, better.
Having said that, I'm using a NIR filter at the moment and the Lodestar does have better sensitivity there. Either way I'm not sure if I'm going to get enough extra sensitivity to turn a complete lack of apparent stars into ones that I can guide on. I think I'd really just have to get a much bigger chip, which when combined with that kind of sensitivity... I'm probably looking at big bucks, and probably something more traditionally used for imaging than guiding.
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