09-15-2021 12:50 PM
It seems highly unlikely that all 3 of your cameras have a failing shutter.
I would suspect a lens problem in your case. You may have an aperture blade failing on the lens. Does the problem only happen with that one lens?
09-15-2021 01:27 PM
The lens has worked fine on other cameras. Can the lens cause a problem with the camera?
Worked fine on other cameras at the same time as the three cameras you mentioned have a problem, or worked fine at other times?
09-15-2021 01:33 PM
I have used the Canon 70-200 lens for 5 and a half years on three different Canon cameras: 2 70 D's and one 90D. My problems with all three cameras happened when I was using that lens. In other words, after I couldn't use one Canon camera anymore, I used the lens on the next Canon I bought and it worked until the same problem happened. And then again with the 90D which failed last night.