I have a D7100 and have used it for astro work - both with standard camera lenses and with a scope.
If I had the choice, I'd go with the d750 because it has a better sensor than the D7100. Putting it into crop/APSC mode is not that big a penalty, right?
There are a few threads over on another astro forum saying the D7100 is the worst possible camera for astro work and just about anything else is a better option. I've had no trouble with mine, but don't have a reference to compare it with.
Cheers,
V
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