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
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.
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