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A canon EOS camera can autofocus with a lens that has a max aperture of 5.6 or less(1-series, up to f/8), in the telephoto end of this lens it is a f/6.3, the autofocus doesn't "go out" it isn't functional because it isn't designed to be. I wouldn't get a lens this consumer level, quality, function, and build would be horrible.A guy at work has both the 28-300 and the 28-200 (maybe 18-200) anyway, both sigmas. He said the 28-300 is awful compared to the other one. Terrible autofocusing, terrible quality. Image quality is suppossed to be OK, but the autofocus probably won't last long. His did, but has problems. Google that lens, and you'll find all kinds of people complaining that the autofocus goes out.
However, I think you can get a 6 year warranty with that lens (?). In this case, who cares how much it breaks? worst case, you'll be stuck without a lens for a couple months. (something to consider)
What's your budget?
Anyway, to sum it up... if you don't need the 300, you might want to look into a 18-200 or 28-200. I own 2 very nice Sigma lenses, and am impressed...but can't necessarily say the 28-300 will have the same build quality.
A canon EOS camera can autofocus with a lens that has a max aperture of 5.6 or less(1-series, up to f/8), in the telephoto end of this lens it is a f/6.3, the autofocus doesn't "go out" it isn't functional because it isn't designed to be. I wouldn't get a lens this consumer level, quality, function, and build would be horrible.
Terrible autofocusing, terrible quality. Image quality is suppossed to be OK, but the autofocus probably won't last long. His did, but has problems. Google that lens, and you'll find all kinds of people complaining that the autofocus goes out.
However, I think you can get a 6 year warranty with that lens (?). In this case, who cares how much it breaks? worst case, you'll be stuck without a lens for a couple months. (something to consider)
The AF will still work because it goes with ethe lens' maximum aperture (focal length does not come into it for AF). The max aperture of f3.5 is therefore greater than the 5.6 and AF will work......however
The main thing is that at f6.3 the AF will not be great because the lens needs a lot of light to function properly. Most consumer zooms struggle in lower light. f6.3 is very slow and to be honest you would certainly be better with a faster lens.
a 28-300 does not sounds like very good image quality to me.
I never said it had anything to do with focal length, and I know AF speeds up when opened up more, I'm saying if you zoom into 300mm and the max aperture is a measly 6.3, the autofocus won't just suck, it just plain won't work.