Review Summary
Reader Score: 7.97 (out of 10)
The Canon EF 400mm f/4.0 DO IS USM Lens is Canon's first DO (Diffractive Optics) lens - yielding 400mm f/4 IS performance in a relatively small and light handholdable package. Small and light are of course relative. Someone used to shooting with a Canon EF 28-135mm IS Lens will regard the Canon EF 400mm f/4.0 DO IS USM Lens as being large and heavy. But, someone used to shooting with a Canon EF 300mm f/2.8 L IS Lens will regard the Canon EF 400mm f/4.0 DO IS USM Lens as light (4.3 lb vs. 5.6 lb) and definitely more easily handholdable. I really like the weight of this lens. The difference between it and the 300 f/2.8 feels even bigger than the 1.3 lb spec difference indicates.
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