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Btw, the implications of the focal reducer will usually not just be focal length reduction...that actually may only be by a factor of 0.8x or 0.85x, which doesn't sound a lot. But often - just not always - focal reducers are combined with field flatteners, which flatten the focal plane out so that stars out towards the edges of the image don't look out of focus. Note, I'm not saying yours do, I'm just saying it's quite common for this to happen with fast scopes and/or large sensor chips, and a flattener is how it can be remedied.
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