Table of Contents
Pentax-M SMC 75-150mm f/4
Summary
The SMC Pentax-M 75–150mm f/4 is a compact, manual-focus telephoto zoom introduced in 1980 and produced until 1985, designed for full-frame K-mount film cameras. It was part of Pentax’s M-series—known for compactness and solid build—and aimed to offer the convenience of multiple focal lengths in a single, high-quality package. Optically, it features a 12-element/9-group design, Super Multi-Coating (SMC), and a 6-blade automatic diaphragm. The lens maintains a constant f/4 aperture throughout the zoom range, stopping down to f/32, and focuses down to 1.2 meters, delivering a maximum magnification of ~0.12×. It uses a 49mm filter thread, weighs 465g, and measures 64 × 111mm. It includes a built-in sliding hood, a plastic clip-on cap, and a dedicated hard case. The zoom and focus are controlled via a one-touch push-pull ring, and the lens lacks an “A” setting, so it’s best used in manual or aperture-priority modes on modern digital bodies.
Tech Specs
| Manufacturer | Pentax |
| Series | M Series Zoom |
| Model | SMC |
| Focal Length | 75-150mm |
| Max Aperture | f/4 |
| Min Aperture | f/32 |
| Format | Full-Frame |
| Image Circle | - |
| Minimum Focus | 120cm |
| Focus Rotation | ° |
| Iris Blades | 6 |
| Optical Design | 12/9 |
| Squeeze | none |
| Front Diameter | 64mm |
| Filter Thread | 49mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax K |
| Data Protocol | none |
| Length | 111mm |
| Weight | 465g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1980
Launch Price:
Design Revisions: