Actually I feel the AF on my 7d mark ii is working fine. In fact all the concerns of the AF or IQ arise from my plan to buy a Sigma 35mm f1.4 Art lens in the near future. Because I heard some perple having front or back focus problems with those lens, so I just try to pratice how to test the AF performance of a lens.

EOS R6 Mark II - Firmware requests for clean HDMI, crop options, proxy recording in EOS DSLR & Mirrorless Cameras 12-03-2023; Macro Lens Suggestion for Nail Art in EF & RF Lenses 11-25-2023; Erratic power issue with 6D Mark II in EOS DSLR & Mirrorless Cameras 11-24-2023
\n canon 6d mark ii focus issues

Over the years I have bought and installed a variety of focus screen for the 5D, 5D2, 1D4 and 1Dx. Only one of about 8 screens did not have minor to significant back or front focus issues. The cause is tiny thickness difference in the new focus screen. These issues show themselves as OOF shots when the viewfinder is obviously in focus.

Canon EOS R7 Canon EF 100mm f/2.0 USM Canon EF 200mm f/2.8L II USM Canon EF 100-400mm F4.5-5.6L IS II Canon RF-S 18-150mm F3.5-6.3 IS STM Reply Reply with quote Reply to thread Complain

Been using my Sigma 150-600mm Contemporary with my Canon 5D Mk III, Mk iV and 7D Mk II for 4 years now with great results. My main goal for the body upgrade was to get the much improved (so I thought) AF system on the R5/R6 and better ISO performance.

3HX7.
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    • canon 6d mark ii focus issues