I bought this lens recently, for shooting landscapes and architecture. It is tack sharp, and focuses very fast. I does vignette a lot (enough to see the inside of the lens hood) at 8mm on my 1Ds MKII. BUT...that`s not entirely a bad thing, because it could be used to make some creative photos.

I wanted to find an ultra-wide lens for taking pictures of small rooms. The 14mm is awesome but sometimes not wide enough. Setting this 8-15mm at about 12mm then clicking the de-fish button in Photoshop gives ultra-wide.Not sure if my picture uploads will work so here are a couple linkshttp:...

Consistent Output; Durable

This is a great lens. It was all that I imagined. I love the wide field of view on this beauty. I am a big wide-angle shooter, and this satisfies all my needs. You can capture a lot of different elements in one exposure thanks to this lens.

Consistent Output; Durable; Rugged

Heavy

great lens, just got it today and haven't put it down for a second. I am still wondering how to shoot in the circular fisheye mode that is shown in the second sample image section, would really like to know--why i bought the lens!!

Fast auto-focus; Superior build quality; Super-sharp images

The Canon EF 8-15mm f/4 USM L Fisheye is a more than welcome addition to the Canon lens lineup. The combination of circular and full frame fish-eye in a single lens is a unique offering in the market. It is also capable of delivering technically decent results.

The new Canon EF 8-15mm f/4L Fisheye USM is a world-wide popular accessory. Leveraging on its unique focal length range, the EF 8-15mm f/4L USM, it has become the world's widest fisheye zoom lens.

Dual circular and diagonal fisheye options on full-frame cameras; Impressive image quality; Fabulous L-series build quality and ring-type USM autofocus

Absence of circular/diagonal versatility on APS-C and APS-H cameras; Fisheye distortion effect is minimized at 15mm on an APS-C camera; Quite expensive for a fisheye lens

It's a very nice product

Everything

Nothing

Love the fisheye effect on the full frame sensor

A VERY UNIQUE lens indeed! While a fisheye isn't for everyone, I find that if you're in a rut photographically, put this baby on your camera! If that doesn't get you going, I don't know what will.

Great lens with more functionality than the previous 15mm

Price

There are plenty of inexpensive fish-eye lenses out there, including the Lensbaby Circular Fisheye and the Samyang 12mm F2.8 ED AS NC Fish-eye . But there aren't a lot of zoom designs (Pentax and Tokina both sell a 10-17mm fish-eye for APS-C SLRs), and none other that switch from a fully circular...

Unique, zooming fish-eye design; Full circular image at wide angle; Full-frame compatibility; L-series construction

Hood must be removed for full circular effect; Expensive