Canon Ef 24

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Review by Klaus Schroiff, published July 2005Special thanks to Johannes Matzke, Markus Stamm, Jaroslaw Komasinski, Sander Vermeulen & Marcel van Leeuwen for providing four (...) copies of this lens for testing!IntroductionThe Canon EF 24-70mm f/2.8 USM L is one of main stream pro grade lenses in the Canon line up andvery popular among pro photographers (especially press) as well as serious amateurs. On APS-C DSLRsits field-of-view resembles a classic 39-112mm lenson full-frame cameras which isn"t terribly useful to lớn start with. Here it shows that this lens wasdesigned for full-frame (D)SLRs.
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With a weight of 950g và a kích thước of 83x123mm it is quite a bit heavier and bigger thanmany third tiệc ngọt alternatives but comparable khổng lồ similar lenses made by othergenuine brand manufacturers. The lens has a reverse zooming mechanism so it extends towards the wide endof the range. It is shortest at 70mm. While this may seem odd at first the systemmakes sense when attaching the deep flower-shaped hood which remains highly effectiveat all focal lengths. So with attached hood the kích cỡ of the package remains constant.Still it would be nice if such a lens would not extend at all during zooming.The front element does not rotate during focusing there"re no issues when using apolarizer - without hood that is.The optical construction is made of 16 elements in 13 groups, including one UD elementsand two aspherical elements. The elements are made of lead-free glass.The min. Focus distance is 0.39m resulting is a max. Object magnification of ~1:3.3 at70mm. The lens features 8 circular aperture blades. The filter form size is 77mm.The lens has a ring-type USM drive based on a front-focusing system resultingin an extremely fast AF speed. As usual for modern ring-type USM lenses full-timemanual focusing is always possible in one-shot AF mode.
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The build unique of this lens is exceptional. No significant wobbling và smoothcontrols - almost perfect. The lens is also designed to lớn survive in harsh conditions witha sealing against dust and moisture.