Table of Contents
Pentax-M SMC 150mm f/3.5
Summary
The SMC Pentax-M 150mm f/3.5 is a compact manual-focus telephoto prime introduced in 1977 and produced until 1986, designed for full-frame K-mount film cameras. It was part of the second-generation “M” series lenses, offering a slightly faster aperture and more compact build than its K-series predecessor, while maintaining Pentax’s hallmark of optical clarity and mechanical precision. Optically, it features a 5-element - 5-group design with Super Multi-Coating (SMC) and a 6-blade automatic diaphragm. The lens stops down to f/32, focuses as close as 1.8 meters, and delivers a 0.1× magnification ratio. It uses a 49mm filter thread, weighs just 290g, and measures 63 × 75mm. It includes a built-in sliding hood, a manual aperture ring (no “A” setting), and was typically sold with a dedicated hard case. There’s no internal focusing or weather sealing, but the lens is fully compatible with all Pentax K-mount bodies, including digital cameras with manual exposure support.
Tech Specs
| Manufacturer | Pentax |
| Series | M Series Prime |
| Model | SMC |
| Focal Length | 150mm |
| Max Aperture | f/3.5 |
| Min Aperture | f/32 |
| Format | Full-Frame |
| Image Circle | - |
| Minimum Focus | 180cm |
| Focus Rotation | ° |
| Iris Blades | 6 |
| Optical Design | 5/5 |
| Squeeze | none |
| Front Diameter | 63mm |
| Filter Thread | 49mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax K |
| Data Protocol | none |
| Length | 75mm |
| Weight | 290g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1977
Launch Price:
Design Revisions: