As some know I bought a used RX100 Mark III last week, but I think it's got a small issue. I noticed that the odd shot was softer than I thought it should be so I did some tests shooting a brick wall. Every 6-8 shots or so was soft compared to the rest tested through a range of apertures from f2.8 to f5.6. Shutter speed was at 1/250 to avoid any possible camera shake, focal length was 24mm equivalent. Softness was throughout the frame, although obviously magnified towards the edges. After I'd reviewed the images I started to question what the problem could be, and wondered if it was steadyshot as I have noticed that I can't handhold shots below 1/40 which I found odd as on my EM5-II I can handhold at 80mm equivalent at 1s, yes 1s
So I tested again without steadyshot and the issue appears to improve considerably. Only under the the highest of scrutiny is the odd shot ever so slightly soft, so much so that it's a none issue as far as I'm concerned. So it does appear that steadyshot is causing the issue (although of course this still can't be confirmed) but I was wondering if anyone has had a similar issue.
Here's the 1:1 crops, although I'm not sure how much use this will be as this forum doesn't seem to like images linked from photobucket for some reason and makes all shots look soft.
Notice how the shots at f5.6 are underexposed by 0.7ev too despite the camera being on auto ISO.
F2.8 sharp then soft
f5.6 sharp then soft