0ur opinion:

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The CAN0N EF 100-400mm f/4.5- 5.6L lS USM lens is designed for use with any 35mm Canon SLR Camera that accepts EF-Mount lenses. Manual Focusing - Enabled with focus mode switch and focusing ring (full-time mechanical manual focusing provided) Focusing Range - 1.8m/5.9 ft. to infinity (at all focal lengths) - Does not have macro-focus (close-up) mode Filter Size - 77mm (Filters available at extra cost)

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Equipped with an lmage Stabilizer, the Canon EF 100-400mm telephoto zoom lens makes it easy to capture the far-off action of fast-paced sports or zoom in for an intimate portrait with a blurred background. The lens offer such features as fluorite and Super UD-glass elements that largely eliminate secondary spectrum; a floating system that ensures high picture quality at all focal lengths; two lmage Stabilizer modes; and compatibility with extenders 1.4x ll and 2x ll. The lens carries a one-year warranty.

• Focal length: 100-400mm
• Maximum aperture: 1:4.5-5.6
• Lens construction: 17 elements in 14 groups
• Diagonal angle of view: 24 to 6 degrees
• Focus adjustment: Rear focusing system with USM
• Closest focusing distance: 5.9 feet
• Zoom system: Linear extension type
• Filter size: 77mm
• Dimensions: 3.6 inches in diameter, 7.4 inches long
• Weight: 3.1 pounds

Some more accessories for this product for you:
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Some more accessories for this product for you:

• Tiffen 77mm UV Protection Filter
• Tiffen 77mm Photo Essentials Filter Kit
• Tiffen 77HTCGND6 77MM Digital HT Grad ND 0.6 Titanium Filter
• Tiffen 77HTHZE86 77MM Digital HT HAZE 86 Titanium Filter
• Tiffen 77HTSTR42 77MM Digital HT Star 4 PT 2 Titanium Filter

Piece Availability: Usually ships in 24 hours

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Buyer's feedback: - * Great upper body workout! ...
When I bought my Canon 5D, I could afford only one lens, so I started with the 24-105 L series IS unit. Last December, I treated myself to the 100-400 L IS unit. Naturally, the shorter focal length is handier for most things I shoot (people, scenics, architecture and so forth), but I really wanted to try a longer lens.

For a long while, I waffled between the 70-200 F2.8 IS and the 100-400. Speed, obviously, is a major drawback of the 100-400 at 4.5-5.6, but the 5D is so noiseless at EI 400, that shooting outdoors with the longer lens is never a problem. I am satisfied that I would not be as happy with the shorter lens married to a 2X extender.

Telephoto photography, it turns out, is much different than working with shorter lenses, I've found. Since December, I've shot animals and birds, GP motorcycles at Indianapolis and recently, an air show. In general, I've found it much more difficult than other kinds of photography because the subjects (often moving) are much harder to find and keep framed up than closer, non-moving subjects. Also, the atmospheric effects, like fog or haze are amplified making some images look like they were shot in an opium den.

The IS feature definitely helps handheld shots, but when subjects move as fast as stunt planes and 150 MPH motorcycles, it is very easy to end up with blurred images (unless you want to stop the props on the planes and the spokes on the bikes). I tried mounting the rig on a monopod, but it caused more problems than it solved.

Anyway, back to the lens. It is a brick, and weighs nearly as much. I can't complain about image quality, especially with the full frame sensor of the 5D. I have discovered that, if I'm going to do sports photography, I'd prefer an even longer lens, though. I plan to try the 2X extender, but on this lens, the extra glass may make it unacceptably slow. Of course, with smaller(Canon)sensors, this lens would enjoy 1.6 magnification.

Another finge benefit is that, even at Indy, the "white" lens commands respect from the majority of the rest of the pack (unless they're endowed with even larger white lenses), even if it's not deserved. Evidently, this lens can make you look like you know what you're doing whether you do or not.

At the airshow, I found it challenging to adjust the focal length with this lens (push-pull) as the airplanes would be alternately very close (50 yards) and then a 1/2 mile or more away in a matter of moments. Trying to keep the aircraft in sight and zoom at the same time actually requires more grasping apendages than I was born with. I was alternating shooting with a Sony EX1 XDCAM with a power zoom. Even with that feature, it was still hard to find, frame and follow the stunt planes.

Similarly, if you are trying to fill the frame with a 150 MPH bike as it blows by, some advance planning is required, especially if you want it to be in focus at the time you pull the trigger.

Other than size and weight, I have no real beefs with the lens, although I could react to moving objects better with a conventional zoom ring. Also, I would really like it to reach a little further, say - 600mm. Then, I would have a better reach for wildlife that is often just too small to render a really good image for enlargement. It would still have to be a zoom, however, as I truly appreciate the flexibility of a variable focal length lens. Well, and of course, it could cost less!

Overall, I feel like this is a seriously professional piece of gear that will serve certain aspects of my photographic needs for a long time.

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Buyer's feedback: - Get your hands on this before buying
It's that heavy. I was able to borrow this lens from work, I thought it would be great to test drive an L lens to see how the other half lives.
MY ADVICE: Go to your local camera shop, get your hands on some lenses and talk with the people there. They are in the business because they love photography, not just to sell you something expensive ;) Bring your camera and take some pictures so you can look at them when you get back home and compare this and one that's 1/2 the price and weight.
I'm not bashing this lens, I just felt compelled to write an honest review and give an honest grade.
Pro:
There's no doubt it takes great outdoor pictures.
400mm gets you up close across the field for sports pics.
Con:
Cost - it didn't take significantly better pictures (at 200mm) than the 200mm zoom I have.
Weight - too heavy to hold all game long.
Aperture - must have decent light for shooting sports (unless you specifically want the blur to show motion) and you can't get that f2.0, shallow depth of field.

So if this is on your "short list", I would also include the Canon EF 70-300mm f/4-5.6 IS USM Lens for Canon EOS SLR Cameras

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Buyer's feedback: - * an incredible lens! ...
the reviews before have been quite detailed, and really say it all. I have been shooting, professionally and otherwise, for over 40 years, and I have to say that the Canon L Lenses are the first 35 mm lenses that remind me of the days of shooting with Hasselblads. Incredible sharpness, and wonderful craftmanship of construction.

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Buyer's feedback: - Excellent lens out of the box.
I read many reviews about the limitations of this lens and the drawback of the f4.5 speed. I recieved this lens on Friday and I have shot 700 frames over the weekend. Granted it was a very nice weekend and I had lots of sun, but the pictures were AMAZING. Spent lots of time with the kids on the diving board and at the playground shooting various ISO settings and different shutter speeds, trying to get this lens to fail. Auto-focus very reliable and very accurate. I had some issues focusing close at 400mm, but there are two minimun focus distance settings, and I may have to school myself on that a little more. I shot images all weekend free-hand and I discarded about 20 pics, because of blur (my fault, not the lens).

Very heavy, IS seems to require lots of battery, it is a big lens, and you really know that you are packing a quality piece of glass. It does draw attention.

I am shooting on an XTI w/ grip and seems to be well balanced. I put it on my SLIK tripod and it was very questionable. If you are going to mount this on a tripod frequently, make sure you have a good one. I realized that I had $2500 worth of camera, being supported by a $30 tripod and disassembled the set up after taking some quick shots of the moon (which were excellent).

I bought this lens to shoot my kids in soccer and baseball. Soccer season starts in a couple of weeks and I will update this review after shooting some games.

I am very happy with the lens and the quality, it doesn't take any time to get used to the PUSH-PULL zoom. Manual focus ring is right where my fingers felt comforable on the zoom, so I may have some problems with accidently moving the manual focus ring, when zooming the lens. I need a better camera strap.

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Buyer's feedback: - * Great Lens ...
I bought this lens with the intended use of birding. The image quality is excellent. Very crisp thru out images. Image stabilization is a hugh plus for me in particular. I am a novice when it comes to photography and I have a very shaky hand. In my case I find that a tripod is an absolute must at the far end of the lens zoom range. I attribute this to my unsteadiness not the lens. With budget always being an issue, I carefully picked this lens. The lens seems to be very well constructed "there is nothing cheesy about it". It came with a lens hood, and storage case included. It is well worth the price of admission. I want to say that this lens is an excellent purchase. For any other undecided folks out there do the research, then buy this lens. I am happy to report that you definitely get what you paid for with this lens.