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I’ve used a celestron 0.63x on a c8 and results are pretty decent (but I wouldn’t say an entirely 100% flat field). The spacing is critical for imaging and while i aim for about 105mm some report slightly different depending on the age of the reducer.
Also - shat size camera sensor are you using? I use a 4/3” asi294 which I feel is right on or just above the upper limit that it can handle. A smaller sensor will give a better flatter result.
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