Ultra-wide weather-sealed Pentax 645 prime, 20mm equivalent with SDM AF — the widest lens in the digital 645 system.
The Pentax SMC Pentax-DA 645 25mm f/4 AL [IF] SDM AW is a wide-angle prime for the Pentax 645 medium format system. DA 645 designation indicates digital-era APS-H format optimisation. SDM = Supersonic Drive Motor. AW = All Weather. Pentax 645 mount.
f/4 maximum aperture. 25mm focal length (equivalent approximately 20mm full-frame for 645 format). SDM autofocus. AW weather-resistant. IF (Internal Focus). AL aspherical element. Pentax 645 mount.
The DA 645 25mm f/4 SDM AW is designed for Pentax's digital 645 cameras — providing a wide-angle perspective equivalent to approximately 20mm in 35mm full-frame terms. Weather-resistant construction for outdoor professional use.
On the used market the Pentax DA 645 25mm f/4 SDM AW is a premium medium format wide prime. Condition checks: SDM AF, AW sealing, front element. Pentax 645 mount — digital 645 bodies.