Table of Contents
Pentax SMC 24mm f/2.8
Summary
The SMC Pentax 24mm f/2.8 is a manual-focus wide-angle prime introduced in 1977 and produced until 1984, designed for full-frame K-mount film cameras. It features a 9-element/8-group optical design, Super Multi-Coating (SMC), and a 5-blade automatic diaphragm, offering an 84° diagonal field of view on full-frame (or ~62° on APS-C). With a minimum focus distance of 25cm, it delivers 0.12× magnification, making it suitable for general-purpose wide-angle work including landscape, street, and environmental photography. Physically, the lens is compact and well-balanced, weighing 194g and measuring 63 × 41.5mm. It uses a 52mm filter thread, includes a dedicated PH-S52 hood, and lacks an “A” setting on the aperture ring—so it’s best used in manual or aperture-priority modes on modern digital bodies. The lens was succeeded by the SMC Pentax-A 24mm f/2.8, which shares the same optical formula but adds auto-aperture support.
Tech Specs
| Manufacturer | Pentax |
| Series | K Series Prime |
| Model | SMC |
| Focal Length | 24mm |
| Max Aperture | f/2.8 |
| Min Aperture | f/22 |
| Format | Full-Frame |
| Image Circle | - |
| Minimum Focus | 25cm |
| Focus Rotation | ° |
| Iris Blades | 5 |
| Optical Design | 9/8 |
| Squeeze | none |
| Front Diameter | 63mm |
| Filter Thread | 52mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax K |
| Data Protocol | none |
| Length | 41.5mm |
| Weight | 194g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1977
Launch Price:
Design Revisions: