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I made some new tests with my D7100 in order to test my inconsistent autofocus problem and I came to interesting conclusions. I took photos of three books, the most right book, is the closest to the camera, then 2 cm more far, and the last one (left book) is again 2 cm behind. I have focus on...

I have extracted the exif information from the xmp file of Lightroom. I made some more tests, and I can clearly see that I'm having those problem with aperture < 3.2 If my aperture is 4.5 for example, I got clear sharp photos. When aperture is 2.8, I got most of the time blurry, noisy photos...

I'm shooting in RAW. I'm sure that the subject wasn't moving so I don't think this is the problem. I'm adding 2 photos (cropped) with the problem. You can see the problem clearly when the photo is at maximum resolution (4000x6000) ; the eyes are blurry and very soft... The same photo a few...

I just bought my new D7100 and I'm having inconsistent focussing problems. Sometimes, the focus is very "blurry" & noisy. I think that this happens more with aperture < 3.5. It even happens when I'm shooting with a flash (where I expected to get very sharp photos which isn't the case). Also...