

Strange concentric circle artifacts on Lumix S5 with TTArtisan AF 75mm F2 – only in certain photo modes
Hi everyone,
I recently bought a Panasonic Lumix S5 and noticed a strange issue when shooting photos with a TTArtisan AF 75mm F2 (L-Mount).
I was getting visible concentric circular ring artifacts in my photos, especially in evenly lit areas. At first I suspected a sensor or lens defect.
What I found during testing:
The issue does not appear in video mode.
The issue does not appear in S&Q video mode.
Camera firmware: Body v2.8
Lens firmware: v1.2
No filters attached.
After troubleshooting, I discovered that turning Vignetting Compensation OFF completely removes the artifacts in the normal photo modes (P/A/S/M).
However, the issue still appears when using:
iA (Intelligent Auto)
C1
C2
C3
I'm guessing those custom modes may still be using saved settings or lens corrections, but I'm not completely sure.
Has anyone experienced this with:
TTArtisan AF 75mm F2
Other TTArtisan AF lenses
Lumix S5 / S5II bodies
Is this a known compatibility issue between Panasonic lens corrections and third-party L-Mount lenses?
I've attached sample images showing the artifacts. The photos become completely clean after disabling Vignetting Compensation in the standard photo modes.
Any insight would be appreciated.