Suggested feature to fix focus shift

Started 3 months ago | Discussions thread
OP calin Forum Member • Posts: 97
Re: Suggested feature to fix focus shift

Sittatunga wrote:

But Canon lens' firmware can be updated, through the camera, in a similar manner to updating the camera firmware.

As PAntunes says, stopped down focussing avoids focus shift if the spherical aberration correction isn't very good. It does slow things up a bit and it's not as precise if the lens doesn't suffer from focus shift. The match-triangles manual focus aid can work stopped down seven stops, depending on the lens, distance and subject contrast, though it can struggle stopped down only four stops with a low contrast subject. That's usually ok though, as the worst case for focus shift is about two stops down; more than that and the depth of field should be big enough to cover the focus shift. Focus shift was less of a problem with classical SLR prime lenses which were usually designed to be focussed at full aperture and stopped down at least a couple of stops.

Agree Sittatunga manual focus is a way around the issue but even with the new R5 focus helpers it's harder to focus especially if you pass the camera to someone else.  I'm proposing a way to enable autofocus even throughout the lens range.

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Canon EOS 70D Canon EOS 5D Mark IV Canon EOS R5 Canon EF 50mm F1.8 II Canon EF-S 17-55mm f/2.8 IS USM +5 more
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