If the answer is "Yes!" then buy with confidence. This lens dominates its niche. It delivers on its promises and is one of the classic white L lenses.
I got this lens to supplement the 28-135 IS, but I've ended up rarely using it. In fact, Ive decided that there may be a better choice for many photogs.
First let me begin by stating the obvious. Most images taken with this lens here and on online galleries like photosig or photo*net are taken at 400mm. Duh! I was hunting last weekend and took this lens along shooting animal pics from a blind. I set it to 400 and left it there. For wildlife and landscape shooters in particular, if the lens is going to be used at 400mm practically all the time, I think a better choice might be the 400mm 5.6 primecosts hundreds less and sharper to boot. Going a step further, one sucessful wildlife photog I know recommends that if you are thinking about shooting wildlife other than birds, forego 400mm(prime or zoom)and get the 300mm F4 prime. His opinion: the larger size of most mammals offsets the loss of that last 100mm, yet is sharper, has lower light perfomance for the times of day when most mammals start moving, and yes, less money.
On the other hand, if your passion is shooting animals in a zoo, maybe this lens is for you. Dont have to worry about dawn or dusk shots and the range of the zoom might come in handy.
Sports shooters might actually benefit from the zoom's ability to adjust to capture unpredictable shots, but unless youre right on the sideline I still suspect it will be left at 400 most of the time, so ditto the prime. Ive read that 5.6 can be a bit slow for for fast shutter speeds in anything but optimum light. Of course, the next step up, the 400mm F4 is over five grand, so 5.6 is the practial limit for most average consumers.
In either case, you will be able to substantially reduce this handicap IF you have a sensor that takes good pics at ISOs of 800 or above. Thats not every camera.
I put the lens on my 30D to check the aperture progression for you techies out there. The lens shows F4.5 100~135mm, F5.0 ~135~270mm, and F5.6 thereafter.
People and portraits? Thats where it gets trickier. I can see using 400mm compression for compositional reasons in an environmental portrait, but how much is that market segment? 100mm isnt a bad length for people pics, but doing long-distance photojournalistic stuff had me feeling like I was Magnum PI on a stakeout.
If you're like me and the majority of your work involves people and portraits, the 70-200 2.8 (even non IS) is a much better choice for around the same money. I would have gotten 100x the use out of it over the past year.
I bought this one before I really had the need for it, thinking I would expand my horizons, and it just never happened.
But this lens does shine with its strengths. IS allows you to handhold 400mm pics with greater success than the non-IS prime. I dont do weddings but I can imagine IS allowing this lens as a supplement when a photog is stuck at the back of a church during the ceremony... as long as the lights arent too low.
Right after I got it I was in DC and snapped a few pics of George Bush at the Capitol. Im nobody special and couldnt get any closer than the "Nobody Special" section...not close! This lens got usable pics that I could have cropped way down and still had good resolution close-ups. One of those pics is posted in the customer images here.
Other benefits? The push-pull design allows almost instant adjustments. Because it compresses, its easer to carry than the prime (lengthand size-wise, not weight). And, in spite of the fact that I use it far less than I imagined, I have no plans to get rid of the thing.
So the question boils down to whether you really need the zoom, the IS, and the ranges of this lens at the higher price than the prime. Wildlife/landscape photogs that use tripods? Maybe not. Sports shooters with monopods? Maybe. People shooters like me? I've learned almost never, unless I someday find myself a private detective or a voyeur.
That said, if you weigh your wants and this lens still tugs at your heart, dont hesitate to buy it. It delivers performance and value...within specific parameters.
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