I am facing problem with a Nikon AF 50mm ƒ/1.8 lens which is attached to a Nikon D7100. Although I can change the aperture from the camera (in M mode) it seems that it is not changing in photos. What I mean:
The aperture is locked in ƒ/22 and I am able to select all values (1.8 – 22) from the camera switch. The problem is that in every shoot the photos have exactly the same aperture, ignoring my initial selection in camera. Unfortunately I don't know which is the selected one. If I check the info of each photo I can see the ƒ-number that was selected; however, taking photos from 1.8 to 22 (in the same light conditions and without to change ISO or shutter), all photos appear the same! Which means that the aperture is not changed!
If I select the Auto mode I can see the aperture that the camera selects however, my photos are overexposed, which means that something is going wrong with the aperture selection.
Can anyone help about what to check in this lens? All other lens are working properly so I don't expect problems in camera.