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Cons: Heavy, expensive, scary front element, needs a dedicated filter system which has to be large, and is therefore expensive.

Pros: Optically great, even the distortion is manageable.

Summary: A landscape photographers delight, but not so much fun for architects...

Cons: Extreme buold quality, low flaring, almost no distortion above 18mm, f/2.8 is amazing in possibilities

Pros: weight, size, no filter can be fit (almost not for protection), price

Summary: Perfect quality always! some distortion on small focal length in edges and corners but still much less than on others.

Cons: Expensive (compared with third party rivals), huge, hard to use filters and very prone to flares.

Pros: Decent optics, very handy focal range and excellent build quality.

Summary: Once a groundbreaking ultrawide, this workhorse is now a little old and faces serious rivalries from third party makers such as Tamron 15-30. Still the optic quality is fully comparable even against the newest competitors and the build quality is nothing but exceptional. Huge, bulb-like lens is a pain to use and carry around, but it has helped me make tons of my favorite pictures and finish important tasks.

Cons: No cons

Pros: Love this lens....

Summary: Love this lens......Never experienced any issues with it. Recently purchased the LUCROIT Filter holder and a 2 stop, soft edge graduated filter for it.... Using this lens on my Nikon D3S and Nikon D3.

Cons: Strong focus shift: if you focus at 2,8 but shoot at 4 or 5,6 the image will be blurred and unsharp. You need to compensate this, which can be a pain.

Pros: Very sharp, if you can handle the focus shift.

Summary: Great lens for great pictures: highly recommendable !

Cons: on my new D800 this lens sucks awful. On my D300s was ok but on FX have found the edges to be seriously unsharp. It also won't focus sharply at f2.8. Compared to my friends 14-24 his is absolutely pin sharp so well unhappy.

Pros: should be a great lens but is not

Summary: a lemon and what a lens to get a lemon with:(

Cons: One walks more carefully when carrying this monster ready to shoot. That is with the hood off, exposing the front glass.

Pros: Optical performance absolute unsurpassed.

Summary: Buy this for every DX and FX camera. Used to have a Sigma 8-16 for DX. At a 3rd of the cost, 1/4 of the performance.

Cons: I use it on Canon EOS 5D mkII. The main cons is the lack of autofocus and automatism on the diafragm due the adaptor, but this is my choice. Lens design does not permit the use of filters

Pros: Amazing resolution, much better than any prime from Leica or Zeiss, and of course Canon or Nikon.

Summary: dreaming of Canon may design something like this, meanwhile, the best value for your money

Cons: Exposed large front element.

Pros: Outstanding optical quality at all focal lengths, very minimal distortion, excellent build quality.

Summary: If your thing is landscape photography don't let the filter issue deter you from buying this lens. You will appreciate the freedom that the quality of images taken with this lens even right into the corners wide open produces. This to me outways being able to fit a filter on as there are easy options around this issue.

Cons: On FX : none.

Pros: Sharp over the whole picture, even wide open. Vignetting is moderate and distortion, esp. around 14mm, easily corrected (using DxO for instance). Not very sensitive to flare. Good handling, despite it being bulky.

Summary: Simply stunning. High price, but value is just as high.

Cons: Inacceptable vignetting at maximum aperture.

Pros: No comparable angle of view on a Nikon or Canon...

Summary: No Comparisson to the Zuiko 7-14mm.

Cons: cannot take filters

Pros: truly amazing quality for an ultra wide angle zoom

Summary: no other lens matches its performance and the price is actually pretty good when you consider that the Canon 14mm prime alone costs more

Cons: Price

Pros: It is a crime to stop this lens down. It is designed to shoot @2.8!

Summary: I would put the size and weight into "cons" section but I know you can not trick physics. And... I like its macho look :-)

Cons: Heavy Bit a distorsion at 14mm

Pros: Sharpness Image quality Quick focus

Summary: Probably the best wide angle ever!

Cons: Heavy & Bulky (for me anyway) Can't use filters

Pros: Super sharp at all focal lengths and apertures, with superb build quality. Creates stunning wide angle shots on full frame cameras with rich colours. Resists flare quite well.

Summary: The best wide angle zoom full stop. No need for primes in this range so long as weight is not a problem. And I seem to be able to get away with not using filters so far..