Pentax-A 35-70mm f/4 SMC Lens
Order by 2pm for same-day dispatch
Free Click & Collect from our Harrogate shop
Hassle-free returns
Condition & contents
| Grading | Lens optics are clear of any major defects. |
|---|---|
| Testing | Fully tested |
| Warranty | 6 month warranty |
| Includes | Boxed |
At a glance: Manual-focus Pentax-A constant-f/4 standard zoom for K-mount film SLRs and DSLRs.
About this lens
The SMC Pentax-A 35-70mm f/4 is a compact manual-focus standard zoom from the 1980s film era, built for the Pentax KA mount. Its constant f/4 aperture holds a steady maximum brightness across the whole 35-70mm range, making it a practical, pocketable walk-around lens.
Build & handling
| Focus | Manual focus |
|---|---|
| Minimum focus distance | 0.25m |
| Filter thread | 58mm |
| Weight | 330g |
| Lens construction | 7 elements in 7 groups; 6 aperture blades |
Works with
- Fits Pentax K-mount film SLRs from the manual-focus and A-series era onward
- Compatible with modern Pentax K-mount DSLRs via the shared K bayonet; used in manual focus
- On modern Pentax DSLRs this A-series lens is used by setting its aperture ring to a chosen f-stop (or using the green button for stop-down metering), since the body cannot control the aperture electronically
- On APS-C Pentax DSLRs the 1.5x crop factor gives roughly a 52-105mm equivalent field of view
- Manual focus only; there is no autofocus motor or coupling
Best for
A versatile standard zoom that suits both classic Pentax film SLRs and modern Pentax K-mount DSLRs, thanks to the shared K bayonet. It is manual focus only, so it rewards deliberate, hands-on shooting. Mounted on an APS-C Pentax DSLR, the 1.5x crop factor turns the 35-70mm range into roughly a 52-105mm equivalent field of view, shifting it from a wide-to-short-tele zoom on full frame or film toward a short portrait range on cropped bodies.
Frequently asked questions
Will this lens fit a modern Pentax DSLR?
Yes. It uses the Pentax K-mount, so it mounts directly on modern Pentax K-mount DSLRs. Focusing is manual, and you set the aperture on the lens ring (or meter with the green button).
Does the aperture stay at f/4 across the zoom range?
Yes. It is a constant-aperture design, holding f/4 as the maximum from 35mm through 70mm, which keeps exposure steady as you zoom.
How close can it focus?
The minimum focus distance is about 0.25m, useful for tighter framing of smaller subjects.
What filter size does it take?
It has a 58mm filter thread.