Table of Contents
Pentax-A SMC 24mm f/2.8
Summary
The SMC Pentax-A 24mm f/2.8 is a compact, manual-focus wide-angle prime introduced in 1984 and produced until 1989, designed for full-frame K-mount film cameras. It was the final evolution of Pentax’s 24mm f/2.8 lineage, succeeding the K-series version and retaining the same 9-element - 8-group optical formula, but adding the all-important “A” setting on the aperture ring for full Program and Shutter-Priority automation on compatible bodies. Physically, it’s a lightweight and travel-friendly lens, weighing just 205g and measuring 63 × 42mm. It uses a 52mm filter thread, stops down to f/22, and focuses as close as 25cm, delivering a 0.12× magnification. The lens lacks internal focusing or weather sealing, but includes a manual aperture ring, a PH-S52 clip-on hood, and was typically sold with the HA-90 hard case. The 5-blade diaphragm is a bit unusual for a prime of this class, and contributes to its distinctive bokeh.
Tech Specs
| Manufacturer | Pentax |
| Series | A 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 | 42mm |
| Weight | 205g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1984
Launch Price:
Design Revisions: