Ultra-wide-angle lens for serious applications. Easy to hold and carry at 14.3 oz. (405g). Floating rear focusing system. Sharp images are obtained at all subject distances.
Pros: excellent close ups, great dof, light weight/small, very sharp
Cons: falloff/vignetting, can't stack filters
Have had this lens since the mid 1990's when the street price was high. Yes there is corner falloff and vignetting in a 5D MKll, so what shoot around those limitations and you have one fine lens. Stacking filters is not a good idea. I get tack sharp results very fast autofocus, great low light performance and you can stick it in someones face and get a nice shot that isn't so exagerated that it looks comic book. Takes great close ups with great depth of field. I recommend that anyone who has difficulty first try the autofocus lens compensation on the 5DMKll and see if that helps. I have used this on three other APS Canons also several film EOS's(remember film) with equally nice results You also may want to use the 10-22 ES for even better results..
Reading previous reviews about this lens, I was very timid to purchase this lens, but I needed a wide angle lens and this was in my price range. The auto-focus is a little slow in low light [but most lens are] and the crispness of an image at f2.8 takes a little more effort, but overall I think it gets the job done, takes wonderful landscape photographs, and for this price, I don't think you can get anything better. Yes, this lens creates some vignetting stopped all the way open, but it is an ultra-wide wide angled lens, almost fisheye so there's obviously going to be a little. There is also some distortion depending on your area of focus, but again at 20mm, it's almost a fisheye. The distortion is easily correct in photoshop, and like I said earlier depending on your composition and subject matter, most won't even notice.
Overall I think its a great purchase for the ultra-wide angle, price, and quality. Like any lens, it has it's problem areas, and any knowledgable photographer can work their way around it.
Like I said earlier, I love love love using this to shoot landscapes. It can capture so much information, and the color and detail it captures make this lens worth it for me. Seriously, you'll be shocked with how much information you can squeeze into one frame with this camera. I use it with the 5D Mark II - which I feel you would need a full frame camera to really make the most out of this lens.
Pros: Fast auto-focus, Superior build quality, Super-sharp images, light weight, good color and contrast
Cons: vignettes on full frame when wide open
This was a great value for what i wanted. I started using it on my rebel XT, because it was 2.8 and a really wide angle. I don't really buy many EF-S lens because I knew I would eventually move to full frame. The images are really nice and sharp with good contrast. I didn't notice any Vignetting until I did move to a full frame 5D mark II. Bringing the aperture up a few stops controls this only draw back. (and of course fixing it in post) This really is a nice lens and I would highly recommend to any one looking for a sharp, fast, wide angle EF lens.
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