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Just a little more info, you need to make sure the distance is 55mm from the face of the sensor to the face of the last lens in the corrector, if not you will get coma in the outer filed of view..
I use this on my 20D and also on my QHY8. The corrector works on my 22 f4.5 Newt with no probs, so you should have no probs with it.
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