Table of Contents
Pentax-A SMC 50mm f/1.4
Summary
The SMC Pentax-A 50mm f/1.4 is a fast, manual-focus standard prime lens introduced in 1984 and produced until 1989, part of Pentax’s A-series lineup for K-mount 35mm and full-frame digital SLRs. It features a 7-element/6-group optical design, an 8-blade automatic diaphragm, and Super Multi-Coating (SMC) for improved contrast and flare resistance. With a bright f/1.4 maximum aperture, it excels in low-light shooting, portraiture, and shallow depth-of-field work. The lens focuses down to 0.45m, offers a 0.15× magnification, and uses a 49mm filter thread. It weighs 235g, measures 63 × 37mm, and includes an “A” setting on the aperture ring, enabling full Program, Shutter-priority, and Aperture-priority modes on compatible Pentax bodies.
Tech Specs
| Manufacturer | Pentax |
| Series | A Series Prime |
| Model | SMC |
| Focal Length | 50mm |
| Max Aperture | f/1.4 |
| Min Aperture | f/22 |
| Format | Full-Frame |
| Image Circle | - |
| Minimum Focus | 45cm |
| Focus Rotation | ° |
| Iris Blades | 8 |
| Optical Design | 7/6 |
| Squeeze | none |
| Front Diameter | 63mm |
| Filter Thread | 49mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax K |
| Data Protocol | none |
| Length | 37mm |
| Weight | 235g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1984
Launch Price:
Design Revisions: