Pentax DA 12-24mm f/4 AL ED [IF] - Review / Test Report
Lens Reviews - Pentax

Special thanks to Jens Rösner for providing this lens for testing!

Introduction

The Pentax DA 12-24mm f/4 AL ED [IF] is the result of a cooperation between Pentax and Tokina. However, the two lens variants are not identical - that's most obvious regarding the outer construction and cosmetics but the Pentax lens does naturally also feature Pentax' own SMC lens coating. Just like its Pentax DA-type brothers and sisters it is a lens with a reduced image circle with a field-of-view is equivalent to 18-36mm on full format cameras - a typical ultra-wide zoom lens.

The build quality of the Pentax lens is very fine thanks to a combination of metal and plastic parts assembled with tight tolerances. The zoom ring as well as the rather small focus ring operate smooth and slightly damped. The lens has its shortest physical length in the middle of the zoom range and it extends marginally towards the 12mm and 24mm setting. The front element does not rotate so using a polarizer remains easily possible.


Typical for most Pentax lenses the DA 12-24mm f/4 AL ED [IF] has no internal AF motor and relies on a slotted drive screw operated by the camera. Consequently AF operations generate a moderate degree of noise. The AF speed is very fast on the K10D. The tested sample showed a quite pronounced back-focus problem. Thanks to a "Quick-Shift Focus System" manual focusing is instantly possible once the AF has achieved focus - this works very well and noiseless.

Specifications
Equiv. focal length18-36 mm (full format equivalent)
Equiv. aperturef/6 (full format equivalent, in terms of depth-of-field)
Optical construction15 elements in 12 groups inc. 1 ED and 2 aspherical elements
Number of aperture blades8
min. focus distance0.30 m (max. magnification ratio 1:8.3)
Dimensions84 x 88 mm
Weight430 g
Filter size77 mm (non-rotating)
Hoodpetal shaped (supplied)
Other features-




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