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I can't speak to the field curvature, but focusing with live view..I have to back off from the stop slightly to get sharpest focus, very similar to my 21mm.
Rajan Parrikar wrote:
I would like to know if the ZE 15 has a hard infinity focus (focus locks at infinity with ring turned all the way), and field curvature, if any, at f/2.8. These two factors are especially important when shooting Auroras in pitch dark conditions.