Product Details
Sigma 135-400mm f/4.5-5.6 APO Aspherical Lens for Pentax SLR Cameras

Sigma 135-400mm f/4.5-5.6 APO Aspherical Lens for Pentax SLR Cameras
From SIGMA

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Product Description

This compact apochromatic ultra-telephoto zoom lens covers frequently used 400 mm focal length. It is the ideal lens for shooting sports, nature, wildlife, landscapes and other types of photography that frequently use this telephoto range.This lens uses one aspherical lens and three SLD (the special low dispersion) glasses for excellent correction of chromatic aberration. Color aberration in the secondary spectrum is compensated by using three pieces of Special Low-Dispersion glass (SLD), and making high-quality images a reality throughout the entire zoom range.The five-group zoom and rear focus systems ensure high performance stability and ease of use.A removable tripod collar is included as a standard component.

Product Details

  • Brand: Sigma
  • Model: 723-109

Features

  • Dedicated to Pentax AF SLR cameras
  • 135-400mm telephoto offers great versatility for mid- to long-range shooting
  • SLD (special low dispersion) glass elements eliminate secondary spectra effect
  • Rear-focus system makes it extremely easy to work with polarizing filters
  • Advanced design incorporates a 5-group zoom system to achieve sharp, high-contrast results throughout the entire zoom range

Editorial Reviews

Amazon.com Product Description
Covering the most frequently used focal lengths, from mid- to long-range telephoto, the Sigma 135-400mm f4.5-f5.6 APO aspherical lens lets you capture an unprecedented range of images, everything from landscapes to fast-action sports. This lens uses Sigma's exclusive five-group zoom system combined with aspherical lens elements to achieve sharp, high-contrast photographic results across the entire zoom range. The optics of this lens also use special low dispersion glass elements that help eliminate the secondary spectra effect normally associated with telephoto lenses.

The front lens group does not rotate thanks to Sigma's rear focus system, making polarizing filters extremely easy to use. For added convenience, the 135-400mm f4.5-f5.6 APO aspherical lens includes a built-in rotary tripod mount that eliminates vibration, and consequently blurry images, during shutter release. This model is dedicated to Pentax AF SLR cameras.