Table of Contents
Pentax-A SMC 135mm f/2.8
Summary
The SMC Pentax-A 135mm f/2.8 is a manual-focus short telephoto prime introduced in 1983 and produced until 1989, designed for full-frame K-mount film cameras. It was part of the A-series, offering full aperture automation via the “A” setting-making it more convenient than its M-series predecessor while retaining classic Pentax build quality. It features a 4-element - 4-group optical design, Super Multi-Coating (SMC), and an 8-blade automatic diaphragm. The lens stops down to f/32, focuses as close as 1.2 meters, and delivers 0.15× magnification. It uses a 52mm filter thread, weighs 340g, and measures 65 × 77mm. It includes a built-in sliding hood, plastic clip-on cap, and was often sold with the HB-120 hard case. Autofocus is manual only, and there’s no internal focusing or weather sealing.
Tech Specs
| Manufacturer | Pentax |
| Series | A Series Prime |
| Model | SMC |
| Focal Length | 135mm |
| Max Aperture | f/2.8 |
| Min Aperture | f/32 |
| Format | Full-Frame |
| Image Circle | - |
| Minimum Focus | 120cm |
| Focus Rotation | ° |
| Iris Blades | 8 |
| Optical Design | 4/4 |
| Squeeze | none |
| Front Diameter | 65mm |
| Filter Thread | 52mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax K |
| Data Protocol | none |
| Length | 77mm |
| Weight | 340g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
Release Date: 1983
Launch Price:
Design Revisions: