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I've tried to clean focusing screen of my Nikon D750 by removing it out of the body and placed it back after cleaning. From then on, the focusing is acting weird. When I look through the viewfinder, in-focus subjects are blurry and out of focus subjects are clear. When I click a pic, I can see that the out of focus subjects through viewfinder are actually in focus in the picture. Why's this happening?

  • If you look through th OVF, is the text like ISO or shutterspeed displayed clearly? – Alexander von Wernherr Oct 25 '18 at 8:42
  • Yes. Everything is clear except the subject on which focus is locked on. – intruder Oct 25 '18 at 8:43
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    You may have misaligned the focusing screen, knocked the mirror out of place, or changed the diopter setting. – xiota Oct 25 '18 at 9:08
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    Mirror is perfectly in place. Diopter is in usual setting. I think the issue might be with focusing screen. Does wiping it with a microfiber cloth remove some sort of coating on it? – intruder Oct 25 '18 at 9:09
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    Can it be inserted upside down or is it keyed to prevent this? – xenoid Oct 25 '18 at 9:34
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Solved. I accidentally placed the focusing screen by flipping it on other side which made in focus objects blurry. I corrected it and it's back to normal now.

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