11-29-2017, 08:11 PM
Interesting stuff.
I am strugging with a Tamron 17-50 has well (non-VC). It has a tendency to severely front-focus at times. We're talking static shots where I point the lens at infinity, I have only the center AF point activated, yet focus is somewhere near close-focusing distance. The next shot could be spot on.
Since it's an intermittent problem (50% of shots or more) this is not something for AFMA, which fixes lack of accuracy rather than lack of precision. It irks me that in each case I get focus confirmation.
Focus in live-view works flawlessly, as does focus on my old 400D (and 300D before that, now sold).
I just had an idea. What if I started using AI servo instead of one-shot, even for static shots. It should hunt when AF goes awry. I'd lose focus-recompose unless I use back-button focus. I'll have to give this a try later today.
I am strugging with a Tamron 17-50 has well (non-VC). It has a tendency to severely front-focus at times. We're talking static shots where I point the lens at infinity, I have only the center AF point activated, yet focus is somewhere near close-focusing distance. The next shot could be spot on.
Since it's an intermittent problem (50% of shots or more) this is not something for AFMA, which fixes lack of accuracy rather than lack of precision. It irks me that in each case I get focus confirmation.
Focus in live-view works flawlessly, as does focus on my old 400D (and 300D before that, now sold).
I just had an idea. What if I started using AI servo instead of one-shot, even for static shots. It should hunt when AF goes awry. I'd lose focus-recompose unless I use back-button focus. I'll have to give this a try later today.