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Giant dark spots on small f-stop images

Started Jan 7, 2022 | Questions thread
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Tudioloa-25 New Member • Posts: 7
Giant dark spots on small f-stop images
1

Hi,

I've been having issues with my Nikon D7100 the last couple of weeks in that whenever I shoot a picture with an f-stop beyond the largest alternative (1:8 in my case) I get a spot in the middle of the image, the shorter the exposure time the lighter the spot. If I shoot in long-exposure the spot shows up pitch black. Is there a technological issue with my sensor? I've tried different lenses and always get the same result the sensor also appears squeaky clean. 
Thanks in advance.

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Nikon D7100 Sigma 18-35mm F1.8 DC HSM Art
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