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Regarding the image circle and field of view (or angle of view, depending what terminology is being used), the diagonal is usually what determined the angle. As was pointed out by other posters, with different aspect ratios, the FOV looks different for horizontal or vertical directions. However...

Wow, the DxO is really nice--none of the corner "smear" that I see in ACR/LR! Thanks BJPhoto!

I'll add my 2cents and say that most wide angle lens designs have quite a bit of edge aberration, usually coma or astigmatism. Plus, there is generally some rather severe vignetting. For lens design, the term "distortion" literally means a difference in magnification from the center to the edge...

Amin, does Adobe Camera Raw also do the auto correction? I can open raw RX100 images without applying the Sony lens profile, but I do not see much corner difference between RAW and the in-camera JPG. ETA: OK, I downloaded the Capture One Pro 7 trial version and did my own check. ACR (same...