The Pentax SMC-M 50mm f/1.4 is one of those timeless manual-focus lenses that blends compact design, robust build quality, and an optical signature cherished by film and digital shooters alike. Known for its pleasing bokeh, sharp center resolution, and smooth focusing feel, it remains a favorite for portrait, street, and everyday photography.
Quick Overview & Specifications
- Focal Length: 50 mm
- Maximum Aperture: f/1.4
- Optical Construction: 7 elements in 6 groups, Super Multi-Coated (SMC)
- Aperture Diaphragm: 8 blades
- Minimum Focus Distance: 0.45 m (1.5 ft)
- Maximum Magnification: ~0.15×
- Weight: ~236 g
- Dimensions: Ø63 × 37 mm
- Production Years: 1977–1984
Build Quality & Handling
This all-metal lens feels solid yet compact. The focusing ring offers a long, fluid throw for precise manual focusing. The aperture ring has firm, tactile clicks, enhancing the shooting experience typical of Pentax M-series lenses.
Optical Performance
Wide open at f/1.4, the lens provides very good central sharpness, improving to excellent from f/2 onward. Edge sharpness catches up around f/2.8. Vignetting is visible at maximum aperture but greatly reduced by f/2.8. Chromatic aberrations are minimal in the center but can appear towards the edges. Flare control is strong, and occasional backlight artifacts can add a creative touch.
Bokeh & Character
The lens renders backgrounds with smooth, creamy bokeh and delivers a classic, film-like rendering. Colors are natural, skin tones are flattering, and the transition between in-focus and out-of-focus areas feels gentle and organic.
Comparisons & Considerations
Compared to the f/1.7 version, the f/1.4 offers a slightly different rendering style and a shallower depth of field. However, the f/1.7 is smaller and can be marginally sharper stopped down. When buying, check for haze or balsam separation in older copies, as these can affect image quality.
Pros & Cons
| Pros | Cons |
|---|---|
| Excellent central sharpness when stopped down | Manual focus only, slower for fast-moving subjects |
| Compact, lightweight, and robust build | Soft edges wide open at f/1.4–f/2 |
| Pleasing bokeh and vintage character | Visible vignetting and edge chromatic aberration wide open |
| Enjoyable handling with smooth focus throw | Potential for haze or balsam separation in older units |
| Great value on the used market | Not weather-sealed |
🔚 Final Thoughts
The SMC Pentax-M 50mm f/1.4 is a small yet characterful lens that invites a slower, more intentional shooting style. Its combination of pleasing bokeh, tactile handling, and strong optical performance makes it a joy to use on both film and digital bodies. While not flawless—showing softness at the edges wide open and some vignetting—it rewards careful photographers with images full of personality and warmth. For those who appreciate the charm of vintage glass, it remains one of Pentax’s most compelling “fast fifty” options.
