Tokina AF 10-17mm F/3. 5-4.5 at-X 107 DX Fish Eye Canon

I purchased this lens exclusively for underwater photography use. It is recommended by many UW photography sites and UW photographers as a must have lens for wide angle photography. Although I also have a Canon 10-22 mm lens, I thought I'd give this a try and see what all the excitement was about. Well, they weren't kidding. This is a phenomenal tool for UW photography. I shot this through an 8" Ikelite dome using a Canon 7D. Sharpness was very good, even into the corners. You can get very close to your subject and minimize the water column (and particles) to a greater degree than even the Canon 10-22 mm. The distortion you see with this lens above water is not evident below. I was always a bit nervous about using a fisheye, because of the curvature they yield. I was pleasantly surprised how much this is a non-issue underwater. Depth of field is fantastic, allowing wide angle close ups of a small foreground subject, with an expansive scene behind. Wreck photography under some pretty dirty water conditions was also excellent. I've had a great time exploring new techniques with this lens, such wide angle close-ups at a small aperture and slow shutter speed to give a visible or blue water background. The 10 to 17 mm zoom makes it very flexible for changing subject matter. The only negative I've found is a tendency toward purple fringing. This isn't evident unless you pixel peep, and it doesn't seem to have a practical effect on picture quality, but it is evident if you zoom into some images. You really have to watch strobe position with a lens this wide. Push them too far forward and fire them toward full power and you run the risk of hot spots bleeding into the photo. As you might expect, this is especially true when the water is heavy with particulates. With a little care and practice, this problem is readily avoided. This lens also seems to be a good choice for shooting UW video. The high depth of field this lens offers eliminates focusing concerns on cameras like the 7D. In most cases it is focus once and forget. Overall, this was a great purchase. Particularly when you consider the reasonable price, every serious UW photographer should own one of these.

Excellent condition. Very happy with my purchase.

I shoot surf with this lens and I couldn't of asked for anything more perfect. Although it is well built, the zoom and focus ring seem to shift sometimes with vibrations but for the most part it is a wonderful lens.

Works great, used for underwater shooting on a 7D2 with Zen DP100 dome, and I get nice sharp images, even in the corners. This is the holy grail of underwater Fisheye lenses.

This is a great lens for underwater shooting and works well with a Subal housing. The macro and wide angle abilities are great.

Pros:- This lens is very well built. It feels solid.- For the price, it goes to F3.5, which is as good or better than similarly priced lenses.- I wanted a dramatic fisheye effect and this lens certainly delivers.Cons:- When used with a camera like the EOS 20D, it does not support flashes like the 550EX. The flash simply becomes disabled.Overall:If you usually buy L series lenses, you will find the limitations of this lens as a disappointment. However, if you usually stick to the more budget priced lenses, then you will likely enjoy this lens. It is a fine fisheye for the price.

This lens is my baby. I take it with me everywhere I go. I ordered it nearly 4-5 years ago and it is still going strong after exploring Poland, Ireland, Spain, Portugal, Morocco, and even a fall in 4 feet of water!

Despite what the description says, this lens should not be used with a full frame sensor: the built-in hood blocks a large portion of the image. The hood has to be sawed, for instance like that:http://michel.thoby.free.fr/Tokina_10_17/Shaving_the_hood/Wim_method.htmlI'm returning it.