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Hi Tony
The 428 would be a good fit with the 127 scope as the pixel size is the same as the CCD I was using the other night. It would give you a bit smaller FOV to mine due to the smaller chip but the chips in these are good. There are not many reviews of these but they are similar to the 460 - except the 460 has double the pixels of the 428 and a bigger FOV. There are a few reviews of the 460 and this is what I was upgrading to before I took the Atik One option. Basically the same s the 460 with built in filter wheel.
Brian
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