Normal M6 II - EF-M 55-200mm - electronic shutter artifacts?

I notice basically two things that go wrong occasionally with E Shutter and the 55-200 lens.

One is a big blurry horizontal bar across the full image I would explain it with the IS having a stroke while the photo is taken.

The other is some kind of interlaced effect (enlarged in the sample), with the Sigma 56 1.4 (maybe the other lenses too) on the whole image. It's not taken in artificial light, so it's the hardware doing this.

Are both phenomena normal for this camera?

I guess the second photo was made with exposure time < 1/4000? If yes, then it's a known phenomena, but hard to call it "normal". It should not be normal.

Regarding the first photo, I had some cases of more blur in one area of a photo than others when using a  EF-S 55-250mm, but not as severe as yours. And a smoother transition. And using mechanical shutter yields softer photos than with electronic shutter, so you need to be constantly choosing your poison.

Yes on the interlaced the shutterspeed was 1/12800 (doing 1.4 in sunlight which is a nice option to have without using a filter), so what's the deal with that, what conditions trigger it? Will it always be fine if I stay below 1/4000?

Yea I'm not using the mechanical shutter with the 55-250, its just too soft then.

This really is an odd little camera.

nurf wrote:

I notice basically two things that go wrong occasionally with E Shutter and the 55-200 lens.

One is a big blurry horizontal bar across the full image I would explain it with the IS having a stroke while the photo is taken.

The other is some kind of interlaced effect (enlarged in the sample), with the Sigma 56 1.4 (maybe the other lenses too) on the whole image. It's not taken in artificial light, so it's the hardware doing this.

Are both phenomena normal for this camera?

Very interesting. I have not seen either of those with the lenses you mention or with other lenses.

The blurring in the sample you show looks to be sideways movement of the camera (or the lens IS) during the exposure. Your hypothesis might be right. Even at the fastest shutter speed, each 'line' is exposed at the expected shutter speed -- however 'readout' of all lines from top to bottom takes 1/20 - 1/40 of a second, so there was movement of some kind during that 'blur slice' in the middle.

The interlacing in the other shot looks like some post-processing artifact, you might see something like that with very aggressive de-noise, or sharpening, or downsampling, or upsampling. How was that image produced? Was it a raw or jpg image?

Since that interlaced thing with fast e-shutter speeds is a know thing, are there any good counter measures in editing to get rid of them? I guess lens distortion correction is a no-go as this would warp them and create moire when downsizing.

All raw, and I did some search on the lines issue it happens, might look different depending on the software used, but its there in all of them if the speed is fast enough.

nurf wrote:

All raw, and I did some search on the lines issue it happens...

??  Where did you see this?  I looked and didn't find anything.  I've never seen that before on a Canon.

Apparently there are other topics about it right here: https://www.dpreview.com/forums/thread/4651791

nurf wrote:

Apparently there are other topics about it right here: https://www.dpreview.com/forums/thread/4651791

Yes.  Definitely.  Others have posted about the "scan lines" effect at very high shutter speeds.

I'd recommend using a (high quality) CPL or ND filter when the E/V's are very high (instead of ultra-fast eShutter speeds).

R2

I don't own and haven't used the 55-200mm, but I have experienced the same or a similar issue to your first picture with my 18-150mm.

Here's the thread where I asked about it: https://www.dpreview.com/forums/thread/4532838

For whatever reason, it seems that the IS jumped during the exposure, and because of the readout speed of the electronic shutter, that movement caused a blur across a portion of the image.

I still use my 22mm and 32mm a lot more than my 18-150mm, so I can't say it's something I've notice happen again.