EOS Bodies - For Video / Re: Just upgraded from the 60D to 70D - I'm loving the new video capabilities!« on: September 02, 2013, 01:16:36 PM »
How is the sharpness, high ISO performance, read noise, and aliasing? Relative to the 7D/txi/60D?
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I can't believe how sharp this combination is. At 18mm f1.8 center sharpness and contrast is unreal... The 7D never did this! Trounces the 7D 17-55mm f2.8 IS combination and it's a stop plus faster! If only AF weren't dead slow.
Do you have the EF-M 18-55 also? If so, how does its IQ compare with the Sigma 18-35?
For me it's 35, 50 and 135.
I recently acquired a 24-70 2.8 II which I've been using in place of my 35L and 50 1.4 most of the time now as its as sharp or sharper and has great bokeh and color. I generally step-down the fast primes to 2.0 or 2.8 anyway to keep all of my subjects face in focus, so the primes don't have much of an advantage unless I'm looking for a really shallow DOF or am in really low light at greater distance from my subject.
I have the same problem with mine on the 7D and Rebel XT.
Oddly, it's fine on the 5D Mark III.
I presume that with "same problem" you are referring to the general need for different AF adjustments settings?
Interestingly, Roger Cicala at lensrentals.com had a four-part series of articles on autofocus precision, starting with http://www.lensrentals.com/blog/2012/07/autofocus-reality-part-1-center-point-single-shot-accuracy (links to the subsequent articles are at the bottom). Very interesting read in general. In articles 3a and 3b he also found out that newer Canon bodies (from 5DIII onward) if combined with newer lenses focus considerably more accurately than older bodies (including the 7D).
That sort of confirms my own experience:I have never been too satisfied with the AF precision of my 7d anyway, it has always been hit and miss (could of course also be my technique, but what technique can be messed up when setting up the camera on a tripod and point it at a non-moving high contrast target?).
I think I will have to do some shots at daylight this week to see if the type of lighting also plays a role. Although a prime lens like this is of little use if it doesn't AF well in low or artificial resp. mixed light.
Won't the lens focal length be cropped too? Someone correct me if wrong, but this is due to the adapter moving the lens further away from the sensor?
This lens is brilliant, especially for video. Microcontrast is so good wide open.
For most video I'd take IS and a wider focal range over a wider aperture in a standard lens.