11-28-2010, 11:27 PM
[quote name='genotypewriter' timestamp='1290984991' post='4545']
* Inaccurate focus because of less light going to the AF (so forget any real tracking but DOF is so big like on a P&S or a handycam, tracking is not even a real issue)
[/quote]
I can say I've not had any AF problems attributable to a slow aperture - only too few/large AF points in body for my tastes. Or conversely, I've never observed a case where a faster aperture lens has given superior AF accuracy due to that, even in low light. The USM in the 15-85 is pretty quick and accurate, as I often do use it on fast moving subjects at close range, which also gives the lack of DoF issue I keep running into!
The rest of the points again falls into you use the right lens for the job.
* Inaccurate focus because of less light going to the AF (so forget any real tracking but DOF is so big like on a P&S or a handycam, tracking is not even a real issue)
[/quote]
I can say I've not had any AF problems attributable to a slow aperture - only too few/large AF points in body for my tastes. Or conversely, I've never observed a case where a faster aperture lens has given superior AF accuracy due to that, even in low light. The USM in the 15-85 is pretty quick and accurate, as I often do use it on fast moving subjects at close range, which also gives the lack of DoF issue I keep running into!
The rest of the points again falls into you use the right lens for the job.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.