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Ah, now that I can help you with, LOL.
Cameras like the QHY and the likes have the chip about 12-15mm from the front surface of the thread. The last two guide cameras I have used have been the Starlight Xpress SXV Guide-Head, and the Lodestar, with the Lodestar my current guide camera. The beauty of these is the chip is very close to the front of the body, and in effect the body slips into a normal 1.25" eyepiece hole anyway. So "back-focus" isn't the issue it always used to be for me.
Only one way to find out, try it.
Gary
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