Tokina AF 50-135mm f/2.8 AT-X Pro DX (Nikon) - Review / Lab Test Report
Lens Reviews - Nikon / Nikkor (APS-C)
Article Index
Introduction
Analysis

Lens kindly provided for testing purposes by Joris Hol!

Introduction

The Tokina AF 50-135mm f/2.8 AT-X Pro DX is the product of the cooperation between Tokina and Pentax - it is an interesting thought that Pentax (co-)designs are now also available to users of other systems (Canon and Nikon). However, the mechanical implementation is not identical between the two variants though. The Tokina is a dedicated APS-C lens as indicated by the "DX" in the name. Its field-of-view is equivalent to 75-203mm on full format cameras so combined with its relatively large aperture it is obviously meant as a come-back of the classic portrait zoom lens. In this class it competes directly with the new Sigma AF 50-150mm f/2.8 EX HSM DC.

Typical for Tokina AT-X Pro lenses the mechanical quality is excellent thanks to a metal construction combined with smooth and even slightly damped zoom and focus rings. On the downside the metal body also means a comparatively heavy weight despite pretty compact dimensions. The designers have implemented a damped but non-detachable tripod mount. The front element has a special WP ("Water Proof") coating which is supposed to allow an easier cleaning from water drops or finger prints.

A classic Tokina feature is the one-touch focus clutch mechanism to switch between AF and MF by pushing/pulling the focus ring. This can be done in any focus position and works quite well. The lens has no internal AF motor and relies on a slotted drive screw operated by the camera (this means no AF on the D40/D40x). The AF is quite fast and accurate on the D200.

Specifications
Equiv. focal length75-202.5 mm (full format equivalent)
Equiv. aperturef/4.2 (full format equivalent, in terms of depth-of-field)
Optical construction18 elements in 14 groups inc. 3x SD elements
Number of aperture blades9
min. focus distance1.0 m (max. magnification ratio 1:5.9)
Dimensions135 x 78 mm
Weight845 g
Filter size67 mm (non-rotating)
Hoodsupplied, petal-shaped (snap-on)
Other featurestripod-mount




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