Table of Contents
Pentax-A SMC 28mm f/2
Summary
The SMC Pentax-A 28mm f/2 is a fast, manual-focus wide-angle prime introduced in 1984 and produced until 1988, designed for full-frame K-mount film cameras and fully compatible with modern Pentax DSLRs. It was the fastest 28mm lens in the A-series lineup and is often associated with the legendary Zeiss Distagon 28mm f/2 “Hollywood”, sharing a similar optical formula and cult status among vintage lens enthusiasts. Optically, it features an 8-element/7-group design, Super Multi-Coating (SMC), and a 6-blade automatic diaphragm. It offers a 75° diagonal field of view on full-frame (or ~55° on APS-C), focuses down to 30cm, and delivers 0.13× magnification. The lens uses a 49mm filter thread, weighs 215g, and measures 63 × 41.5mm. It includes an “A” setting on the aperture ring, enabling full program and shutter-priority automation on compatible Pentax bodies.
Tech Specs
| Manufacturer | Pentax |
| Series | A Series Prime |
| Model | SMC |
| Focal Length | 28mm |
| Max Aperture | f/2 |
| Min Aperture | f/22 |
| Format | Full-Frame |
| Image Circle | - |
| Minimum Focus | 30cm |
| Focus Rotation | ° |
| Iris Blades | 6 |
| Optical Design | 8/7 |
| Squeeze | none |
| Front Diameter | 63mm |
| Filter Thread | 49mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax K |
| Data Protocol | none |
| Length | 41.5mm |
| Weight | 215g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1984
Launch Price:
Design Revisions: