This is ongoing issue in all photo forums above or below water, suddenly you have extra resolution and when you look at the corners at 100% in Photoshop you discover that the image does not look as sharp as the lower resolution older model, therefore the new camera causes poor corners. In fact the corners are the same as they always were and the image will look the same if you downsample to 36 MP or whatever the resolution of the previous model was.
The actual situation is you can't take advantage of that extra resolution in the corners because the lens does not resolve that well in the corners.
Indeed, well articulated, but has it been definitively shown somewhere? Personally I just don't see it both topside and underwater.
All I've read are allusions to the idea on forums - primarily before the D800 came out in 2012. I've not seen much mention of it since (thought it was debunked) until here and now with the D850 UW.
Of course I've always been a firm advocate for using the best optics possible and when asked I advise people of the importance of lenses vs cameras (and of shooting vs fussing about gear).
I can somewhat see the idea from a "get-the-most-from-your-high-res-camera" perspective but not that one's image will suffer due to some larger relative discrepancy between the sharp center and unsharp corners. That acceptable optics on a D810 (or even D700) may no longer be such on a D850.
I shoot a lot and just haven't seen it. Though I'm not much of a pixel peeper.
I can't recall ever hearing in the film days that soft corners were blamed on film having too much resolution power.
I believe that the current best wide angle/dome combo for 36mp camera is also the current best combo for 45mp camera.
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