Telephoto Zoom lenses for Pentax K-S1
The Pentax K-S1 utilizes the Pentax KAF2 mount & has a APS-C sized sensor. At this time, we have information on 4 Telephoto Zoom lenses that will fit the K-S1.
The K-S1 has a crop factor of 1.5 so you should multiply the lens focal length with 1.5 to get it's full frame equivalence. You can simply click the 
image to visualize how the lens fits the K-S1.
We have also designed an Advanced Lens Search so you are able to uncover your perfect lens.
ModelVisualizeFocal LengthApertureStabilizedWeight
Pentax smc DA 50-135mm F2.8 ED IF SDM50-135mmf/2.8 685g
HD Pentax DA 55-300mm F4.0-5.8 ED WR55-300mmf/4.0-5.8 466g
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Pentax smc DA 60-250mm F4.0 ED IF SDM60-250mmf/4.0 1040g
Samsung D-Xenon 50-200 F4-5.6 ED50-200mmf/4.0-5.6 255g