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Tokina AF 12-24mm f/4 AT-X Pro DX (Nikon) - đánh giá / test Report

Lens reviews - Nikon / Nikkor (APS-C)

Review by Klaus Schroiff, published July 2007Lens kindly provided by Peter Poete!IntroductionThe Tokina AF 12-24mm f/4 AT-X Pro DX is a representative of Tokina"s pro-grade AT-X Pro(Advanced công nghệ - Extra Professional) lineup which is especially renowned for outstandingbuild quality. Interestingly the optical design of the lens is the result of a joint effort by Tokinaand Pentax. However, both manufacturers have a different approach regarding the actual mechanicalimplementation and only the Tokina variant is available for Nikon (and Canon) naturally.Following Nikon"s naming conventions the DX indicates a lens with reduced APS-C image circleso it is not compatible khổng lồ full-frame SLRs (though it"s still possible to mount & use it).On the D200 (used for testing) its field-of-view is equivalent khổng lồ 18-36mm in classic terms soit"s a typical ultra-wide zoom lens here.

Note: the image above shows the Canon variant of the lens.As already hinted above the build unique of the lens is excellent. No wobbling whatsoever.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 pro-grade Nikkors giving it a pleasant feel.The kích thước remains constant during zooming and the front element does not rotate - usinga polarizer is possible without any problems even with attached hood (flower-shaped).A one-touch focus clutch mechanism makes it possible to lớn switch between manual & auto-focusby moving the focus ring back và forth. This can be done in any focus position.The lens has no internal AF motor & relies on a slotted drive screwoperated by the camera. AF speed is a non-issue in this lens class but it"s fine enough anyway.

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