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Canon R3 Users: Are you experiencing (any) focusing issues? I am!

Started Jan 13, 2022 | Questions thread
MarshallG
MarshallG Veteran Member • Posts: 8,951
Re: The Spot AF Problem

Mike Engles wrote:

Since the AF is using ALL the pixels, each spot is a cluster of pixels already.

The R5 has 45 million pixels and the order of 5000 AF points,so theoretically each AF point is a cluster of 9000 pixels. That is my understanding, I could be wrong

That is why eye AF works so well,except when it does not, which is due to a lack of enough contrast.It works if the AF point sits on a area of sufficient contrast, which is possibly why the intended and the actual spot AF point varies.

I don’t know down to the pixel how it works. I assume you’re right, but I think even though the smallest “spot” is many pixels, it is often too small to find contrast.

 MarshallG's gear list:MarshallG's gear list
Canon EOS R5 Canon EF 50mm F1.4 USM Canon EF 85mm F1.8 USM Canon EF 16-35mm F2.8L II USM Canon Extender EF 1.4x II +4 more
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