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Since the optics in the CPC are stock standard SCT optics and not the aplanatic EdgeHD optics, you'd get some curvature at f10 and more at f6.3 (so long as the corrector wasn't a field flattener as well). If you're going to image in the equatorial, you'd be better off buying an EdgeHD OTA and sticking that on a EQ mount. Why stuff around removing the CPC from its fork mount just to take piccies???. Or buying the EQ wedge, which is your best option here. However, you'll need a good steady tripod because the scope on the EQ wedge isn't the most stable of configs.
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