Table of Contents
Pentax-M SMC 50mm f/1.7
Summary
The SMC Pentax-M 50mm F1.7 is a compact, manual-focus standard prime lens for Pentax K-mount 35mm and full-frame digital SLRs, produced from 1977 to 1984. It shipped with many early Pentax bodies. With a 6-element/5-group optical design and Pentax’s Super Multi-Coating (SMC), it delivers excellent sharpness, contrast and color rendition—especially from f/2.8 onward. The fast f/1.7 aperture offers shallow depth-of-field and low-light versatility, while the 6-blade diaphragm produces smooth, natural bokeh. It focuses down to 0.45m, uses a 49mm filter thread, and weighs just 185g in a durable all-metal 63 × 31mm barrel. A popular kit lens for the Pentax K1000 and ME, it remains a favorite among vintage lens enthusiasts for portrait, street and everyday photography. It works with all Pentax digital SLRs and can easily be adapted to mirrorless cameras.
Tech Specs
| Manufacturer | Pentax |
| Series | M Series Prime |
| Model | SMC |
| Focal Length | 50mm |
| Max Aperture | f/1.7 |
| Min Aperture | f/22 |
| Format | Full-Frame |
| Image Circle | - |
| Minimum Focus | 45cm |
| Focus Rotation | ° |
| Iris Blades | 6 |
| Optical Design | 6/5 |
| Squeeze | none |
| Front Diameter | 63mm |
| Filter Thread | 49mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax K |
| Data Protocol | none |
| Length | 31mm |
| Weight | 185g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1977
Launch Price:
Design Revisions: