About Pentax 17-70mm f/4 DA SMC AL IF SDM Lens for Pentax Digital SLR Cameras:
PENTAX 21740 17-70mm f/4 AL (IF) SDM Zoom Lens
Features Pentax 17-70mm f/4 DA SMC AL IF SDM Lens for Pentax Digital SLR Cameras:
- Equivalent focal length of 26-107mm in 35mm format, when used with digital SLR cameras.
- ED and aspherical elements compensate for chromatic and spherical aberration.
- The image circle of the lens has been created to match the smaller image recording area of digital SLR cameras.
- The Quick-Shift Focus System allows to instantly shift to manual focus once the subject is captured by AF.
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