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Hi kosh, I am having a similar problem with my 10" f 4.5 newt. Visually the collimation looks good but as soon as I put a camera on the difraction spikes on the stars are off center and the stars on one side of the image are elongated but round at the center of the image. When the weather clears I am going to try and collimate the scope using the camera in liveveiw at 10x magnification. I have an 8" f6 and have never had any problems collimating it. maybe fast scopes are really that much harder to get right.
Cheers Rick
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