The Canon EF 70-200mm f/2.8 L IS USM Lens balances out great build quality with excellent image quality. Images are sharp wide open (f/2.8) - corner performance is remarkable even with a full frame body. Stopping down to f/4 delivers even sharper results with better contrast.
It is one of the most-professionally-used lenses available and finds a home in the kit of many, many serious amateurs as well. The Canon EF 70-200mm f/2.8 L IS USM Lens delivers fixed focal length lens performance in a much more versatile (in my opinion) package. Use the included ISO 12233 Resolution Test Chart sample crops to compare the 70-200 IS with some of the fixed focal length lenses in this focal length range such as theEF 135mm f2.0 L and the EF 85mm f1,2 L IS II USM The primes have some advantages (a wider aperture is one of the biggest) and I use them, but the versatility of 130 other instantly-available focal lengths causes me to far more frequently use the 70-200 IS. Having zoom versatility can mean the difference between getting the shot and getting nothing with a young, energetic child. Any cropping required on a picture shot with the prime will quickly negate any image quality advantage it has.
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