Table of Contents
Pentax-A SMC 24-50mm f/4
Summary
The SMC Pentax-A 24–50mm f/4 is a compact manual-focus zoom lens introduced in 1984, designed for the Pentax KA mount. It features a constant f/4 aperture across its wide-to-standard zoom range, making it a versatile option for landscape, street, and general-purpose photography. Optically, it uses a 9-element, 7-group design with Super Multi-Coating (SMC) to reduce flare and improve contrast. The lens includes a 6-blade automatic diaphragm, stops down to f/22, and supports 58 mm filters. It focuses down to 0.3 meters, achieving a 0.21× magnification ratio, and weighs 285g, with a compact length of 66mm, making it well-balanced on both film and digital bodies.
Tech Specs
| Manufacturer | Pentax |
| Series | A Series Zoom |
| Model | SMC |
| Focal Length | 24-50mm |
| Max Aperture | f/4 |
| Min Aperture | f/22 |
| Format | Full-Frame |
| Image Circle | - |
| Minimum Focus | 40cm |
| Focus Rotation | ° |
| Iris Blades | 8 |
| Optical Design | 11/10 |
| Squeeze | none |
| Front Diameter | 64mm |
| Filter Thread | 58mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax K |
| Data Protocol | none |
| Length | 68mm |
| Weight | 375g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1984
Launch Price:
Design Revisions: