Sigma AF 50-150mm f/2.8 EX DC HSM (Nikon mount) - Review / Test Report
Lens Reviews - Nikon / Nikkor (APS-C)

Lens kindly provided for testing purposes by Markus Wegerhoff!

Introduction

The Sigma AF 50-150mm f/2.8 EX DC HSM is one of two large aperture tele zoom dedicated to APS-C DSLRs (the other one is the Tokina AF 50-135mm f/2.8 AT-X Pro DX). Its field-of-view is equivalent to 75-225mm on full format cameras. As such these lenses are basically a revival of the classic 70-200mm f/2.8 zooms (on full format cameras). Due to the reduced image circle the Sigma has a comparatively lesser need for large diameter glass elements so it is a comparatively compact and light weight lens.

The build quality of the lens is excellent thanks to high quality materials assembled with very tight tolerances. The broad, rubberized zoom and focus rings operate both very smooth and even slightly damped - a rare characteristic these days. Unlike the Tokina counterpart Sigma decided NOT to implement a tripod mount. This is a bit of a borderline approach - most users will probably use the lens hand held anyway but those who would like to mount it on a tripod or monopod will probably object the mediocre balance here. The length of the lens remains constant regardless of the zoom and focus setting and the front element does not rotate.

The Sigma has an internal HSM ("Hypersonic Motor") AF drive which operates both fast and silent. The AF was a little unsure at times but when paying a bit of attention the AF accuracy of the tested sample was fine. However, it is also worth to mention that the tested sample has been re-calibrated by Sigma once before.

Specifications
Equiv. focal length75-225 mm (full format equivalent)
Equiv. aperturef/4.2 (full format equivalent, in terms of depth-of-field)
Optical construction18 elements in 14 groups inc. 4 SLD elements
Number of aperture blades9
min. focus distance1.0 m (max. magnification 1:5.3)
Dimensions76 x 135 mm
Weight770 g
Filter size67 mm (non-rotating)
Hoodbarrel-shaped, snap-on type (supplied)
Other features-




© by photozone.de