Tokina AF 50-135mm f/2.8 AT-X Pro DX - Review / Test Report
Lens Reviews -
Canon EOS (APS-C)
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Lens kindly provided by Rainer Deissler!
The Tokina AF 50-135mm f/2.8 AT-X Pro DX is the product of the cooperation between
Tokina and Pentax which are now subsidiaries of the same company - it is an interesting
thought that Pentax (co-)designs are now also available to users of other systems
(Canon and Nikon). Nonetheless the Tokina is not identical to the Pentax variant of the
lens - mechanically at least. The Tokina is a dedicated APS-C lens as indicated by the
"DX" in the name. Its field-of-view is equivalent to 80-216mm 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.
Thanks to the reduced image circle and the moderate zoom rage the lens is still
reasonably compact at 135x78mm. Tokina AT-X lenses have an outer shell made
of metal resulting is a comparatively heavy weight of 845g. Consequently the
designers have also implemented a damped but non-detachable tripod mount.
The optical design is quite complex with 18 elements (fully-coated) in 14 groups
including 3x SD elements. The front element has a special WP ("Water Proof") coating
which is supposed to allow an easier cleaning from water drops or finger prints.
The min. focus distance is 1.0m resulting is a max. object magnification of 1:5.9 at 135mm.
The aperture mechanism has 9 aperture blades. The filter size is 67mm.
A deep flower-shaped, snap-on type lens hood is also part of the package.
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. Another classic Tokina feature is the One-touch focus clutch mechanism
which allows 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 does still rely on an AF micro-motor (in EOS mount) but the AF speed is
fairly high. Typical for Tokina AF motors the sound of it is a little squeaky.