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.

Edited January 26, 20196 yr by ENGTick

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.

In the TO's image, this looks like Newton's rings to me.

Edited January 27, 20196 yr by Chrissie

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

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

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.

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 December 13, 20204 yr by txtrigg

Looks like a lens reflection (reflected back) on a UV filter or any other glass threaded on the end of the lens.

Edited March 2, 20214 yr by Eskimotom
clarification

I agree with Eskimotom.  These look like very mild lens edge reflections onto the camera sensor -- filters would add to this, as long exposure noise would, too.  Take the same picture with a different lens at the same speed.  If it shows up again, but looks larger, smaller, fewer or more rings -- it would suggest mild internal lens reflection.

One possible solution MIGHT be a longer lens shade or a slower shutter speed (to reduce noise -- which I assume was already reduced).

Edited March 5, 20214 yr by XKAES