Tokina AF 12-24mm f/4 AT-X Pro DX (Nikon) - Review / Test Report
Lens Reviews - Nikon / Nikkor (APS-C)

Lens kindly provided by Peter Poete!

Introduction

The Tokina AF 12-24mm f/4 AT-X Pro DX is a representative of Tokina's pro-grade AT-X Pro (Advanced Technology - Extra Professional) lineup which is especially renowned for outstanding build quality. Interestingly the optical design of the lens is the result of a joint effort by Tokina and Pentax. However, both manufacturers have a different approach regarding the actual mechanical implementation 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 circle so it is not compatible to full-frame SLRs (though it's still possible to mount and use it). On the D200 (used for testing) its field-of-view is equivalent to 18-36mm in classic terms so it'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 quality 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 to pro-grade Nikkors giving it a pleasant feel.
The size remains constant during zooming and the front element does not rotate - using a polarizer is possible without any problems even with attached hood (flower-shaped).
A one-touch focus clutch mechanism makes it possible to switch between manual and auto-focus by moving the focus ring back and forth. This can be done in any focus position. The lens has no internal AF motor and relies on a slotted drive screw operated by the camera. AF speed is a non-issue in this lens class but it's fine enough anyway.

Specifications
Equiv. focal length18-36 mm (full format equivalent)
Equiv. aperturef/6 (full format equivalent, in terms of depth-of-field)
Optical construction13 elements in 11 groups inc. 2 aspherical elements and 1 SD element
Number of aperture blades9
min. focus distance0.30 m (max. magnification ratio ~1:8)
Dimensions84 x 90 mm
Weight570 g
Filter size77 mm (non-rotating)
Hoodsupplied, petal-shaped
Other featuresfocus-clutch AF/MF switch




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