I just did my Canon EOS R write up (for weddings)

wockawocka

EOS 7D MK II
Sep 13, 2011
757
91
You can't stop banding in silent shutter, not 100%. I think the Sony A9 has anti flicker in silent mode but that's imperfect.
 

Mt Spokane Photography

I post too Much on Here!!
Mar 25, 2011
15,470
708
In the manual at the bottom of page 150 and in the notes on page 151 are some of the cautions. In low light situations with a wide open lens and high shutter speeds its particularly a problem. That might occur when a flash is used in a dark area and the lens is set to full aperture.