Recent M6 Mark II shutter shock study / M50 upgrade path rant

RLight wrote:

The trouble becomes if you use a zoom in less light and push the IS for stills use,

No. The problem occurs at certain shutter speeds on lenses that have IS, regardless whether IS is on or off. Lighting has nothing to do with it, except that the effect might be less visible if the image quality is already degraded by poor lighting.

...The question becomes one of how often it shows up, was it a problem problem, and does electronic shutter make sense for those cases, or not?

Electronic shutter completely solves the problem.

It looks terrible on MTF charts, but it doesn't seem to be a huge problem. Under most conditions you might never notice, but it can be obvious with a small crop. These were taken seated handheld with elbows braced, so it measures shutter shake, not hand shake. This is the worst result I found with the EF-M 15-45, and it's reproducible. (That's the only EF-M lens I have.) I suppose I should also have tried it without elbows braced, but tough luck.

45 mm, 1/125 second, mechanical shutter, handheld

45 mm, 1/125, electronic shutter, handheld

Comparing cameras, I can tell you that my SL1 (18 MP) has a nice smooth shutter and mirror, and at 1/60 second, 250 mm the SL1 beats the M6II.

In my tests it occurred mainly at specific focal lengths and exposure times. Here it is at 250 mm, 1/60 second. There is significant shock, and the SL1 gives a better image. But at 1/80 second there is little shock, and 1/20 second there is none.

250 mm, 1/60 second, handheld

250 mm, 1/60 second, handheld, cropped