Used Pentax SMC DA 17-70mm f/4 AL IF SDM
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Condition & contents
| Grading | Excellent used condition overall with only minimal signs of use. Some slight fading to zoom ring but zoom & focus smooth. Optics free from haze/fungus. |
|---|---|
| Testing | Fully tested |
| Warranty | 6 month warranty |
| Includes | Front/Rear Lens Caps & hood |
At a glance: Pentax smc DA 17-70mm f/4 AL IF SDM - constant-aperture standard zoom for K-mount APS-C, 26-107mm equivalent.
About this lens
The smc PENTAX-DA 17-70mm f/4 AL (IF) SDM is a constant-aperture standard zoom for Pentax APS-C, covering a 26-107mm equivalent range. The SDM designation marks Pentax's Supersonic Direct-drive Motor for quieter autofocus, and the constant f/4 aperture across a 4x range makes it a more capable everyday lens than a typical variable-aperture kit zoom.
Build & handling
| Focal range | 17-70mm (26-107mm equivalent on APS-C) |
|---|---|
| Optical construction | 17 elements in 12 groups, including aspherical |
| Autofocus | SDM (Supersonic Direct-drive Motor) - quiet in-lens focusing |
| Focus | Inner focus (IF) |
| Minimum focus distance | 0.28m |
| Coverage | APS-C only (DA) |
| Filter thread | 67mm |
| Weight | Approx. 485g |
Works with
- Pentax K-mount APS-C bodies
- Stabilised by in-body Shake Reduction on Pentax bodies
- Not designed for full-frame - DA covers the APS-C image circle
- 67mm screw-in filters
Best for
A genuinely useful single-lens solution for Pentax APS-C - wide enough at 26mm equivalent for interiors and landscape, long enough at 107mm for portraits, with a constant f/4 that keeps exposure predictable. The close 0.28m minimum focus adds flexibility for detail shots. A natural upgrade from an 18-55mm kit zoom without stepping up to a heavier f/2.8.
Frequently asked questions
What is SDM?
Supersonic Direct-drive Motor, Pentax's in-lens ultrasonic focus motor. It is quieter than screw-drive focusing, which matters for video and discreet shooting.
How does it compare to the 18-55mm kit lens?
Wider at the short end, considerably longer at the top end, and a constant f/4 rather than a variable f/3.5-5.6 - so it holds its aperture as you zoom. Build quality is also a clear step up.
Specifications
| Focal Length | 17-70mm |
|---|---|
| Lens Type | Zoom |
| Max Aperture | f/4.0 |
| Lens Mount | Pentax K Mount |
| Condition | Used |
| Brand | Pentax |