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Bullseye Artifact on Long Exposures

ENGTick

By ENGTick,
in Sony Alpha Full Frame Cameras

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ENGTick

ENGTick 0

Posted
Posted (edited)

Hi. Newbie hobbyist who started last June. Does anybody know what would cause the "bullseye" in the center of this shot? I shot this using an a7r iii with FE 2.8/24-70 GM lens. My settings were 15 sec, f/4, iso 800. Also, I didn't see the bullseye on shots at 5 sec, f/4, iso 800. I had Long Exposure NR off for both shots. Thanks.LRG__7R36521.JPG.2d3102687a1c68314ed49e93851656b3.JPG

Edited by ENGTick
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VTC

VTC 71

Posted
Posted

Odd but taking a wild guess here... Stabilization turned off? It's recommended for tripod use. When shooting with a matte box if I'm not careful shooting towards the sun or have the flag off position I'll get a reflection of the lens on the 2nd surface of the filter but it presents much larger than what's shown here.

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  • 1 year later...
dbmiller

dbmiller 13

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Posted
16 hours ago, ArnoldLayne said:

Allow me to add my own 'bullseye puzzle. I agree the OP photo looks like Newton's rings, now that I know what that is. But my bullseye is much larger. Have you seen this? It's not dependent on lens. a6000

DSC09837-39stack-hdr-1280.jpg

Looks like the lens correction being applied for vignetting. And possibly then pushed in post?

Try turning off "Shading Comp." on the camera. Google that and you'll find a bunch of info.

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  • 2 months later...
txtrigg

txtrigg 0

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I have the same issue with my A7RIII - I looked at my raw files  out of the camera and they all had this bull's eye. I'll try the same Shading Comp setting. I was also using compressed raw files - I know there have been some issues with compressed raw images and originally thought this was related. I'll have to go see if I can find any of them - I think I trashed them all because the bull's eye was so stark it made them unusable.

 

*edit: added my camera model.  

Edited by txtrigg
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