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Sigma 17-70mm F/2.8-4.5 DC Macro K Mount Autofocus Lens For Pentax APS-C Sensor DSLRS {72}

Model #241833
  • $100.00

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New in box complete with manufacturer's USA warranty. Not previously owned or used.
Essentially new with no signs of use. “Open box.” In manufacturer's packaging with original accessories and instructions. 180-day warranty.
Barely used with virtually no traces of wear. Only the closest inspections will reveal slight use. Lens glass could contain light dust or debris. Excellent picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Lightly used with limited signs of wear. Exceptionally nice but may have slight wear on finish visible. Lens glass could contain light dust or debris. Excellent picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Noticeably used with average signs of wear. Shows moderate wear for the age of the item, with the possibility of blemishes and/or minimal dings. Lens glass may have average dust and zoom/focus ring tension may have slight looseness or tightness overall, but will not affect picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Frequently used with above-average wear. May have dents, dings, or finish loss. Lens glass may have small scratches, dust, and blemishes, and zoom/focus ring tension may have moderate looseness or tightness overall, but should not affect picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Heavily used with extensive visible wear. Equipment is rough, with multiple impressions in the finish, excessive finish loss and brassing. Glass will have marks, fungus and/or heavy/cloudy haze which could affect picture quality. Accessories usually not included, unless noted in listing. Not covered under KEH warranty.
Non-functional or damaged. Equipment will not work. Usable for parts. Not covered under KEH warranty and non-returnable.
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Sigma 17-70mm f/2.8-4.5 DC Macro: one lens from wide to short tele on Pentax APS-C.

For Pentax K-mount shooters who want a single walkaround lens without giving up close-focus capability, this Sigma covers 17-70mm with a maximum aperture of f/2.8 at the wide end. That f/2.8 opening gives you real low-light headroom when shooting wide, and the macro capability means you can get genuinely close to small subjects without swapping glass. It's a DC-designation lens, meaning it's built specifically for APS-C sensors than adapted down from a full-frame design.

The 72mm filter thread is worth noting for anyone who already has a filter kit, it's a larger front element than many kit lenses, and it takes standard circular polarizers and ND filters without adapters. Autofocus is built in, so it works with Pentax K-mount bodies that rely on in-body AF drive systems. For a photographer who wants to travel or shoot events with a single zoom that handles everything from environmental portraits to close-up detail work, this lens covers that ground without requiring a dedicated macro lens in the bag.

Who It's For

Street and travel photographers working Pentax APS-C bodies will appreciate the 17mm wide end for tight urban spaces and the 70mm reach for isolating subjects in a crowd. Macro-curious shooters who don't want a dedicated macro lens get genuine close-focus capability built into an everyday zoom. Documentary and event photographers benefit from the f/2.8 maximum aperture at the wide end when working in mixed or low light. Garden and product photographers who occasionally need to get close to small subjects can do so without swapping lenses mid-shoot.

Key Features

  • 17-70mm zoom with f/2.8-4.5 variable aperture
  • DC lens engineered for APS-C sensors
  • Macro capability for close-focus work
  • Autofocus with Pentax K-mount
  • 72mm filter thread
  • Single lens covers wide to short tele range

FAQ

What's the actual range of this lens on a Pentax APS-C body?
17-70mm native. It's a DC lens built specifically for APS-C sensors, not a full-frame design scaled down.
Can you shoot macro with this, or is that just marketing?
It has genuine macro capability built in, so you can focus close without swapping to a dedicated macro lens. That matters if you're shooting detail work alongside wider environmental shots.
Does autofocus work on all Pentax K-mount bodies?
It works with K-mount bodies that have in-body AF drive systems. If your body relies on ultrasonic AF motors in the lens itself, check compatibility first.
What filter size do I need?
72mm. That's larger than most standard kit lenses, so if you already have filters in that size, you're set. Standard circular polarizers and ND filters thread straight on.
How much light can you actually get at 70mm?
f/4.5 at the long end. The f/2.8 max aperture is only at the 17mm wide end, which is where you get the real low-light advantage.
Is this a travel lens or a specialty tool?
It's a walkaround zoom. 17-70mm covers wide environmental work through short tele, and the macro capability means you're not blind to close detail. One lens handles most shooting scenarios without swaps.
SpecificationValue
Focal Length17-70mm
Max Aperturef/2.8-4.5
MountPentax K

This description was generated using AI based on KEH's internal product standards, product expertise, and knowing what customers care about most. While we strive for accuracy, details may vary by individual item.

Brand Name Sigma
Filter Size 72mm
Focus Type Autofocus (camera motor)
Lens Mount Pentax KAF SMC-FAJ
Lens Type Wide-Angle, Standard / Normal
Max Focal Length 70mm
Min Focal Length 17mm