Originally Posted by neuroanatomist
Can I throw in a maybe?Or atleast, a yes, but perhaps it won't be effective?
I've heard on this forum that some lens, even fancy expensive wide aperture primes, require different microadjust levels at different subject distances. They'll front focus at certain distances and back focus at others. Microadjust simply can't correct for this. Perhaps your Canon falls into that category, and you set up microadjust just fine, for one specific distance. If that's the case, and if the Sigma works with a fixed adjustment value (and perhaps that value is 0), then it's a no-brainer which is best. You go with the lens that can accurately focus, and has the wider aperture.
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