I converted to L series lenses a few years back and was blown away by the quality of the images and the lens build quality. Having said that, my budget doesn't stretch to the f28 lenses. The f4 lenses are on my radar and im very happy with the results.

Abbe paglagayo keya? price se 1 lakh kam kar, jo maan me aya likh diya

Pros - Ultra-wide angle - Great image quality throughout the image - Includes IS - Great price for what you get Cons - f4, but expected given the price - Minor barrel distortion, but totally acceptable given the wide angle - Physically a bit larger than I would have liked, but is acceptable

Image quality is fantastic and is fairly easy to operate though is a bit bulky. i now need to review my own technical skills.

Bulky

For the first few days I was dissapointed but later i have realised this is much better for shooting flats than the Zeiss 18 3.5 ZE i had before. It's great for wide angle shoots and ok for portraits at 35mm but I wish Canon would just make lens like Zeiss 15mm 2.8 for the price of the 16-35 4 IS

Versatile, IS is a killer good, distorsion in not bad; Sharpness is not too bad in corners

I guess it's sharper than other canon wide zooms but not as close as sharp as Zeiss 21mm 2.8 ZE; Out of focus part seem a bit weird as if they are result of camera shake

Another winner by Canon. I find this lens very difficult to find faults with. In fact this might be the first time I could not come up with a Con for this lens. Initially I thought the only possible negative I could come up with is that F/4 is not enough for certain astrophotography situations.

Landscape dream lens; 77mm Threads; Sharp images corner to corner even at F/4; IS; Locking Lens Hood

Not really; but in specific astrophotography situations; the aperture is not wide enough

This new ultra-wide angle zoom lens should replace Canon's venerable 17-40mm f/4L optic in their line up of professional lenses. It sports a zoom range of just over 2x and a constant maximum aperture of f/4.

Outstanding sharpness across the frame from maximum aperture; Excellent build quality; Relatively lightweight; Reasonably low distortion; Low CA; Image stabilisation; Fast autofocus; Dust and moisture resistance

Distortion is wavy at 16mm; Far corners remain darker than the image centre; even when stopped down to f/16

Not a lens that I use a lot but it is great for that wedding photo with a difference - the group photo or a close up of the couple with a great background. Also good for interior shots where flash is not permitted

Upgraded from Canon's 17-40 L and the difference in image quality improvement is really noticeable. Images are pin sharp right into the corners even wide open. The IS is handy for low light too. Got some superb night shots of New York with this lens.

It is hard not to be happy with this lens, between its IS & durable yet lightweight build, it is the best wide angle for action sports, landscapes and general purpose shooting. With it being F/4, I've never found it to be a limiting factor and couldn't be more happy with its edge to edge sharpness.