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Well in astronomy you usually want your telescope to be able to observe different targets. So it depends on the details of how the correction surface has to change when the image-object distance.

If it's just a mild deformation and offset, then yeah I guess technology similar to adaptive mirrors could work well.

Distances are usually treated as infinity, at least in astrophotography. I'd be surprised if this secondary lens was able to distinguish between light coming from 1ly and 1000ly

Doh, of course. Not sure what I was thinking.

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