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Funny you should say that, Peter. That was what started all of this. I was thinking about getting an ONAG, but it occurred to me that I didn't know how it provided a bigger FOV as I'd read before, since the FOV should only get bigger if the sensor size changes, or the focal length changes, or if the sensor size remains fixed but it gets more illumination.
The ONAG, according to my understanding simply gives you access to the entire FOV available, as opposed to just the edges that an OAG gives you, but it doesn't make it all available at once, so it seems unlikely to make any significant difference to me... if I rarely found a guidestar, it would make a difference, but I always find one, I just have to rotate... and with the ONAG it means rather than rotating, you move the "stage" around if I understand correctly.
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