This is a stunning full frame ultra wide angle lens. The aspherical and special glass also helps to pack everything into something portable. It's solidly built and has a very smooth focus and zoom. A little heavy, but doesn't bother. There is no barrel distortion here and I actually had to place the subject in a contrasting situation in the sun to see any chromatic aberration at the edge at all. Other photo reviews say it's sharper than the Nikon and Canon versions, which I can believe. Canon 10-22 f3.5-4.5 is slower and more expensive and doesn't even have a lens hood. The hood is made of plastic in the shape of a petal. Spring. The bayonet lock forwards and backwards is very convenient. Of course there are light reflections when you photograph against the sun, but I don't care. The sun is made so small that it does not distract attention and becomes part of the composition. The "Standard" style in the T3i gives good shadow detail, which makes up for it. F2.8 is an advantage when shooting indoors without a flash. A lot of people don't even know I did anything. 11-16 seems like a narrow range, but I still spend all my time with the 11mm focal length and use it as a general purpose lens. The area is only intended for minor adjustments. I will switch to another 17-50 lens if I want something different. Both are APS-C sensors. It claims to work with a full-size 16mm sensor, but I wouldn't buy it on that basis. The 104-degree viewing angle isn't tiring, like using a curved fisheye lens. I've tried some fisheye transforms on the T3i camera so this option is always available for my view. No "thin” filter is needed on the lens. Another review says anything under 6mm is fine. The standard 4.5mm 77mm filter works fine for me with no vignetting. Applying filters is not recommended at 11mm. The usual minimum focus is around 0.8 feet. In the test shots, the length of the ruler at the edge of the filter, from 5/8" to infinity, shows everything sharp at apertures up to f22. I set the focus to minimum, but it doesn't really matter. Be careful with closely spaced ones Objects colliding with a lens. They're definitely closer than they look and anything under 6" shows non-circular distortion. I actually touched the hood on the corner of a stone building and got a good shot, even at f22 for that Deep F22 is also good for eye-catching 18-ray starbursts on point light sources as this has a 9-blade aperture Even the thinnest macro ring will not work as the object plane is somewhere inside the lens Pop-up flash images have full coverage , but showing the bottom shadow of the lens itself at 11mm. At 16mm it's almost gone but still there. Remove the flash cover and a ring lamp with a big enough donut hole for it? Some early reviewers had issues with the quality of the AF/MF forward/reverse ring, but mine works great and is more convenient to use than the tiny switch on my Tamron 17-50. The autofocus struggles with close subjects due to the great depth. Keep it at a distance. I mistakenly left it on manual focus in dark conditions and things in the distance were blurry. At f2.8 some focus is required. The view is very wide for landscapes, but so what? Place an object nearby in a corner. I intentionally frame a whole bunch of things with my legs. Comfortable flowers work too.
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