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Maybe, maybe not. I'm wondering if your diagonal can be adjusted as well. I remember reading somewhere (I'll try to find it) about collimating refractors that if you're going to use a diagonal then collimate without and then adjust the diagonal if possible (by adjusting the screws underneath?) I'll dig the article up tomorrow night, I know its on one of the other computers.
The other option (and it removes one level of glass from the train) might be to get an extension tube for increasing the image scale and shot prime with the ToUcam from there. That way you know your collimation will be spot on. Just a thought.
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