The grand appeal of this prime is that offers the telephoto reach and fast f/2.8 aperture of Canon's 70-200/2.8 professional lenses, but at far less cost and size. In practical terms, the 200/2.8 is fast enough to shoot nighttime football games that would have slower f/5.6 consumer zooms struggling to reign in motion blur.
Unlike consumer zooms, it also takes well to a 1.4X teleconverter, giving the equivalent of 280mm at f/4. The USM autofocus system is quick, silent, and sure in almost any lighting, and because this 200/2.8 is essentially a longer version of Canon's legendary 135/2, it's plenty sharp all the way from f/2.8. Finally, because it's small and black, the security at sporting venues is far more likely to let you take it inside.
It's not all roses though. 200mm on a 1.6X crop body is a 320mm equivalent in view angle. That's a lot of lens to handhold without stabilization. Pure sharpness doesn't stand for much when the whole frame is blurred by handshake. Despite the fast f/2.8 aperture, it takes a lot of light to keep the shutter speeds up, and this lens isn't all that forgiving below 1/400; good technique and proper bracing are essential. My copy suffers further from color fringing around highlights and loss of contrast in sunlight to a greater extent than any other lens that I own. Shooting into the sun, or with the sun just outside the frame, is not a forte.
If you want versatility, there are also better choices than the 200/2.8. Framing options are limited, and you'll rarely find the composition afforded by 200mm exactly matches what you intended. While the 70-200/2.8 series are no stronger optically than this lens, they'll get the shot every time purely by the ability to track an object at 70mm and rapidly zoom to 200mm to take the picture. The addition of IS (image stabilization) alone doubles the number of keepers on the 70-200/2.8 IS. If your livelihood depends on your results, that's worth the price of admission.
But if you're not molting fifties, and you just want a sharp and fast telephoto that'll manage better shutter speeds, sharpness, background blur, and contrast (in most circumstances) than a consumer zoom, this 200/2.8L is a great choice.
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