I’m looking for a smaller, Canon camera to carry around with me when I want to leave all my other Canon gear at home (own an SL1, 70d, 5d ii, and an R6), for stills only. No video. I think I’ve settled on the m100 or the m200. Is there a big difference between these 2? AF speed? Low light performance? I can purchase any of the following from a friend: the EFM 11-22, 22 & 32, and the Sigma 56 lenses. I was also looking at the M6ii but since I own other cameras that are slightly “larger,” I wanted to keep this as small as possible…
Thank you!
buy those 4 lenses from your friend for a great price
get a m6II which has e-shutter, can shoot up to ss 1/16,000 in direct sunlight, and works great with those lenses and dxo Photo lab with NR
You beat me to it! ;-)
To the OP (welcome BTW), the M6ii would be able to replace all of those DSLRs (even the 5D2), and still maintain a very compact form factor with much improved autofocus, resolution, and feature set!
In fact it'll surpass all of the camera bodies listed, including the M100 and M200 in low light ability (esp with the addition of DxO Photolab 6)... save for the new R6 of course

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The extensive capabilities of the M6ii have been well documented (here's a previous thread with some good information and samples)...
https://www.dpreview.com/forums/thread/4501836
Follow the links in that thread for more samples.
Seriously, for something that rivals even the R6 in capabilities (esp the autofocus using Spot AF with Servo), the M6ii is my all-time favorite "fun" body. Plus it maintains the familiar ergonomics and 3-wheel exposure adjustments of the other Canon cameras.
Anything smaller, and I just reach for my phone. ;-)