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Tokimãng cầu AF 11-16milimet f/2.8 AT-X Pro DX (Canon) - Đánh Giá / Lab Test Report
Lens Reviews - Canon EOS (APS-C)

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review by Klaus Schroiff, published August 2011We tested the Tokimãng cầu AF 11-16milimet f/2.8 AT-X Pro DX already baông chồng in 2008 so we"ve sầu reused most of the old article for this new kiểm tra.Special thanks to lớn Daniel Flinkmann for providing this lens for testing purposes!IntroductionThe AF 12-24mm f/4 AT-X Pro DX was a huge success for Tokimãng cầu và it remains one of the most attractive lenses from a price/performance perspective sầu. Obviously this wasn"t enough for Tokimãng cầu though - in 2008 they released the Tokina AF 11-16mm f/2.8 AT-X Pro DX. The lens still targets the APS-C DSLR market only but it offers a little kiông xã at the wide end plus a full extra f-stop in tốc độ. These two improvements didn"t come for không tính tiền - Tokina had to lớn limit the zoom range lớn a mere 5milimet (1.45x). Some of the readers out there were already joking whether this is a fix-focal or zoom lens. However, when thinking about it the decision is actually quite smart. By avoiding a bigger zoom ratio Tokimãng cầu seemed khổng lồ have sầu focused on unique rather than quantity and most users have sầu a standard zoom lenses starting at 17mm or 18milimet so there isn"t much pain in limiting the range at 16milimet. The covered field-of-view is equivalent to 18-26mm (1.6x crop) on full format cameras so we are obviously talking about an ultra-wide angle zoom lens here. The Tokimãng cầu AF 11-16milimet f/2.8 AT-X Pro DX is currently offered for Canon, Nikon và Sony APS-C DSLRs.
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The 11-16mm f/2.8 looks và feels virtually identical lớn its 12-24milimet f/4 cousin - consequently it shares all its qualities here like the excellent build quality. The outer shell is made of high-quality polycarbonate whereas the zoom mechanism is made of metal. The lens has a crinkle finish similar lớn some Nikkors giving it a pleasant look and feel.The physical form size of the lens remains constant regardless of zoom or focusing operations although the inner tube moves a little. Typical for all lenses with internal focusing (IF) the front element does not rotate.
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The 11-16milimet f/2.8 uses a standard micro-motor for auto-focusing which is a little dated in the Canon world. The focusing speed is Ok - regarding the ultra-wide character of the lens the motor doesn"t get much work anyway. Noise-wise it is noticeable but not obtrusive sầu. Switching between manual and auto-focus isn"t done via a small switch as typical for most lenses but via a focus clutch mechanism by moving the focus ring baông xã và forth. This can be done in any focus position.