Table of Contents
Pentax-A SMC 28-80mm f/3.5-4.5
Summary
The SMC Pentax-A 28-80mm f/3.5–4.5 is a manual-focus standard zoom lens introduced in the mid-1980s for the Pentax K-mount, designed as a versatile walkaround option for film SLRs. It was one of the few zooms in the A-series to receive Super Multi-Coating (SMC) and a more advanced 12-element - 9-group optical design, distinguishing it from the simpler, non-SMC Takumar-A and Pentax-A variants that shared the same focal range. The lens features a variable aperture from f/3.5 to f/4.5, stopping down to f/22–32, and uses a 5-blade automatic diaphragm. It focuses as close as 80cm, delivering a modest magnification ratio, and uses a 58mm filter thread. It weighs 355g, measures 63 × 75mm, and includes a manual aperture ring with an “A” setting, enabling full program and shutter-priority modes on compatible bodies. There’s no internal focusing or quick-shift, and the front element rotates during focusing—making polarizer use a bit tricky. It was typically sold with a hard case (HB-120) and clip-on plastic cap.
Tech Specs
| Manufacturer | Pentax |
| Series | A Series Zoom |
| Model | SMC |
| Focal Length | 28-80mm |
| Max Aperture | f/3.5-4.5 |
| Min Aperture | f/22-32 |
| Format | Full-Frame |
| Image Circle | - |
| Minimum Focus | 80cm |
| Focus Rotation | ° |
| Iris Blades | 5 |
| Optical Design | 12/9 |
| Squeeze | none |
| Front Diameter | 63mm |
| Filter Thread | 58mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax K |
| Data Protocol | none |
| Length | 75mm |
| Weight | 355g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1986
Launch Price:
Design Revisions: