Canon ef 24


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Reviews by Klaus Schroiff, published March 2015
IntroductionFull format cameras were a high-end game during recent years but slowly and steadily the prices are falling và today, it is at the verge of entering the mainstream segment of the market. Canon recognized this movement with a new, affordable "kit" lens - the Canon EF 24-105mm f/3.5-5.6 STM IS. However, compared lớn its APS-C format cousins, the pricing isn"t really negligible at around 450EUR/600US$. Even so it keeps a comfortable distance towards its professional grade counterpart - the Canon EF 24-105mm f/4 USM L IS which is a somewhat dated lens by now.
The comparatively big EF 24-105mm f/3.5-5.6 STM IS has a pretty good build quality - not quite L class but not quite on the usual kit lens cấp độ either. The lens body toàn thân is made of high unique plastics based on a metal mount. The lens extends significantly towards the 105mm setting but even so the inner lens tube remains tight. That being said the lens is a bit prone khổng lồ zoom creeping which is probably why Canon incorporated a transport loông chồng. The rubberized zoom ring operates smoothly. A lens hood is, unfortunately, not part of the package albeit at least optionally available.
Canon"s new STM ("Stepping motor") is optimized for silent và smooth operations và as such it is also usable for movies (to lớn a certain degree). The AF isn"t as fast as Canon"s ring-type USM drive sầu but it is quite snappy và noiseless. The focus accuracy of the tested sample was good. STM works "by wire" so you actually drive sầu the focus motor by turning the (very smooth) focus ring. However, this is hardly noticeable & certainly one of the better implementations out there. Similar lớn ring-type USM lenses, full-time manual focusing remains possible.Canon also implemented an image stabilizer with a claimed efficiency of up to lớn 4 f-stops (expect less than that if you enjoy your coffee) - which is actually better than on its L-class counterpart.Below is a paper-spec màn chơi comparison to lớn the Canon EF 24-105mm f/4 uSM L IS which is probably the most obvious reference lens for Canon users in this specific class.

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SpecificationsCanon EF 24-105mm f/3.5-5.6 STM ISCanon EF 24-105milimet f/4 USM L IS
Optical construction17 elements in 13 groups inc. 1xUD and 2x aspherical elements18 elements in 13 groups inc. 1x SUD và 3x aspherical elements
Number of aperture blades8 (circular)
min. focus distance0.4m (max. magnification ratio 1:3.3)0.45m (max. magnification ratio 1:4)
Filter size77milimet (non-rotating)77mm (non-rotating)
Hoodbarrel-shaped, bayonet mount, optionalbarrel-shaped, bayonet mount, supplied
IS efficiency4 f-stops3 f-stops
AF motorStepping motor (STM)Ring-type ultrasonic (USM)
Weather SealingNoYes

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