Dumb question: Do I see it right that the APS-C lens on an A7 is only 10MP in crop mode - but how is that in terms of video -? So I could use it on both sensor formats - for photo then rather on the APS-C camera...but video with the A7 would have no quality loss ?

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That's absolutely right, I tested it that way and it works. 4K corresponds to approx. 8.something megapixels, so that the sensor area in crop mode still offers sufficient resolution with around 10 megapixels.

Your data. Your choice.

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Question about Sigma 16mm f/1.4 DC DN (C), Sony E

Dumb question: Do I see it right that the APS-C lens on an A7 is only 10MP in crop mode - but how is that in terms of video -? So I could use it on both sensor formats - for photo then rather on the APS-C camera...but video with the A7 would have no quality loss ?