Yesterday I tried to recreate Dpreviews findings that the K3 III will not give sharp images at 1/125s when the camera is mounted on a sturdy tripod. The theory is that it is due to shutter shake.
To my surprise I got the same results. It is not due to shutter shake however.
I used the camera on a tripod and engaged the 2s self-timer that locks up the mirror. I shot first at the metered shutter speed (quite slow; 1/5 - 1/2s) at 100ISO, then boosted the ISO until the speed was 1/125s. The slower shutter speed images were sharp; the 1/125s weren't. The fuzzy images were sharper in the center and gradually worse towards the edges. Worst at the far edges. At the far edges it can be seen that the subject is streaked; like like start trails at long exposure. Ie the fuzzyness is due to rotation. This can also be deduced from the fact that the two images were slightly rotated compared to each other in spite of the fact that they were shot few seconds apart while mounted on a tripod.
It is clear that the sensor is rotating during exposure. SR is supposed to be off when using this mode. I tried to turn SR off manually, but the camera (naturally) says that SR is not available in this mode.
It seems like the SR is on or malfunctioning in 2s mirror lock mode.
I tried to shoot at 1/125s in normal manner; that is without mirror lock. All images turns out super sharp. Hence, there's no shutter shock (or mirror slap for that matter) at 1/125s.
I hope this is a bug that can be fixed in software. Either SR is on during 2s self timer mode or it is malfunctioning somehow in this mode. My camera has Firmware 1.01.
Last edited by Pål Jensen; 06-10-2021 at 03:54 AM.