Table of Contents
Pentax SMC 28mm f/3.5
Summary
The SMC Pentax 28mm f/3.5 is a high-performance manual-focus wide-angle prime lens for Pentax K-mount 35mm and full-frame digital SLRs, produced from 1976 to 1977. It features an 8-element/7-group optical design with Pentax’s Super Multi-Coating (SMC) for excellent contrast, color fidelity, and flare resistance. Though slower than its f/2 sibling, it’s widely regarded as the sharper of the two, delivering edge-to-edge sharpness and minimal chromatic aberration—especially when stopped down to f/8. The lens includes a 5-blade automatic diaphragm, a close-focus distance of 0.3m, and a 52mm filter thread. It weighs 261g and measures 63 × 47mm in a solid all-metal barrel engraved smc PENTAX 1:3.5/28. With a 75° diagonal field of view on full-frame, it’s ideal for landscapes, architecture, and street photography. Though relatively rare, it remains a cult favorite among Pentax enthusiasts for its optical precision, compact build, and classic rendering. The SMC Pentax 28mm F3.5 is the slower of the two K-series 28mm wide-angle lenses, with the Pentax 28mm F2 being the faster, larger, and more expensive option.
Tech Specs
| Manufacturer | Pentax |
| Series | K Series Prime |
| Model | SMC |
| Focal Length | 28mm |
| Max Aperture | f/3.5 |
| Min Aperture | f/22 |
| Format | Full-Frame |
| Image Circle | - |
| Minimum Focus | 30cm |
| Focus Rotation | ° |
| Iris Blades | 5 |
| Optical Design | 8/7 |
| Squeeze | none |
| Front Diameter | 63mm |
| Filter Thread | 52mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax K |
| Data Protocol | none |
| Length | 47mm |
| Weight | 261g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1976
Launch Price:
Design Revisions: