Versatile Pentax APS-C zoom with constant f/4 across 17-70mm, quality upgrade from kit lenses with SDM autofocus.
The Pentax DA 17-70mm f/4 AL IF SDM is a standard zoom for the Pentax K APS-C digital system. DA designation indicates APS-C format coverage. SDM = Supersonic Drive Motor (ultrasonic AF). IF = Internal Focus. Pentax K mount.
f/4 constant aperture. 17-70mm zoom (26-107mm APS-C equivalent). SDM (Supersonic Drive Motor) AF. Internal focusing. Weather-resistant (WR) construction. At approximately 430g. Pentax K mount.
The DA 17-70mm f/4 SDM provides a wide standard zoom range for APS-C Pentax cameras — equivalent to 26-107mm — with the advantage of a constant f/4 aperture throughout. SDM motor enables fast quiet autofocus. A practical walk-around zoom for Pentax K digital cameras.
On the used market the Pentax DA 17-70mm f/4 SDM is a versatile Pentax K standard zoom. Condition checks: SDM AF operation, front element condition, constant f/4 aperture. Pentax K mount — APS-C digital recommended, but usable on full-frame with vignetting.