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Cons: Not excellent sharpness in the corners, He suffers a lot flare in backlight

Pros: 12mm fullframe Special lens Video usage

Summary: if you have anything close at wide aperture you may lose focus. I focus manually for critical work. Conclusion It’s the only wide-angle lens that I have owned (with the exception of Sigma’s DX 8-16) that is not used at the extremities very often. From 15mm to 24mm it’s a great lens for architectural photography. From 12 -15 it’s a wide-angle monster which could easily get out of control in the wrong or experienced hands. ---------- print stickers | sticker | printing | printing services | business printing

Cons: This lens is to be used between F8 and f/11 for best sharpness. More open will show very soft corners, particularly at short focal distances, and closing further will make the image quality more even but softer (although a well applied sharpness filter will most likely take care of that). Slight distortion and one or another bad corner at the shorter end, Photoshop will the first, not the corner. Curved focus plane make for delicate, manual focusing a must for best results. Hardly any filter can be used (I know, there are some huge ones that together with the adapter will cost half the lens price or more, forget it!) At 24mm, the lens is not as sharp as my Canon 24-105 L, but the Canon shows a strong barrel distortion while the Sigma has none.

Pros: Great price. As wide as you can get. Very affordable. Very well built. During many years Sigma\'s was the only option in ultra-wide zooms, pricing difference still make it a strong contender to Nikon\'s and Canon\'s excellent recent offerings.

Summary: Unbelievable possibilities at an affordable price, that´s what this lens offers. As a professional dedicated to architecture, I started using this lens in its first version and got hooked to it. When jumping to the Canon 5d MkII I had to switch to this sharper one, as the previous was too soft for 21MP. I have deeply been in love with both, in spite of the bad talk from some so-called purist photographers who could not give credit to Sigma for a good lens. Actually, I use it for 80% or more of my architectural shooting. Primes, Nikon 28 and 35 PC, and Canon L zoom get much less used due to the incredible angles and the fast working pace this lens allows me.

Cons: Its a slow lens; to get the best out of it, a tripod is needed unless in very good outdoor light. The design of the lens shade and sleeved cap means that after a few weeks use, the paint on the outside of the lens shade is getting marked.

Pros: Spectacularly wide angle of view Very sharp stopped down. Relatively low distortion for a lens of this type

Summary: I've been using my 12 -24 for 4 months with a Canon 5D mk 2; a camera which will show up the weakness in any lens. It’s a specialist optic, not a general propose lens; so not only is it unique, it needs skill to get the best out of it. The extreme perspective at 12mm is what drew me to this lens and its giving spectacular results. Like the previous 12-24 mk1 (which I still own), it needs to be stopped down to get the best results. At F8 to F11 its sharp; even at the edges at 12mm. At f 5.6 at 12mm it’s a soft at the edges but sharp at the centre. At F10 or F16 it performs much better at the edges than I would have expected. If I want to pixel peep at 200% then I can see a hint of colour fringing at 12mm; I’n practice its never likely to be noticeable. As I don’t shoot grey cards I can only say that vignetting is not a significant problem (as it is on my L series 24-105). Again Lens flare has not been a major problem; however there have been a few occasions where I have had to shield the lens with a book or my hand. Anyone experienced with an ultra wide should not expect anything else if shooting towards the sun. Distortion at 12mm can be a distraction; but at 15mm, barrel distortion is negligible and this is still ultra wide for FF. I compared the results at 24mm with my Canon 24-105 and I would say without doubt that the Sigma is just as sharp in practice and is more usable as there is virtually no linear distortion at all. Autofocus is fine and silent; however with a lens of this type it will invariably focus at the long end of a room so if you have anything close at wide aperture you may lose focus. I focus manually for critical work. Conclusion It’s the only wide-angle lens that I have owned (with the exception of Sigma’s DX 8-16) that is not used at the extremities very often. From 15mm to 24mm it’s a great lens for architectural photography. From 12 -15 it’s a wide-angle monster which could easily get out of control in the wrong or experienced hands.

Cons: Not excellent sharpness in the corners, He suffers a lot flare in backlight

Pros: Angle of awesome on FF, Building Strength, distortion, overall optical yield, reduced vignetting

Summary: AWESOME WIDE ANGLE LENS ... must buy !!!

Cons: Flare Soft in viewfinder, hard to focus.

Pros: 12mm fullframe Special lens Video usage

Summary: It 's not an easy lens. Good results when you know how to work with it.