prime35mmvintage
SMC Pentax-M 50mm f/1.4
Pentax · 1977-1984
Pentax's fast standard lens in the compact M series. The f/1.4 aperture provides excellent low-light capability and subject separation. Superb build quality with smooth focus operation.
Known for
- Low light photography
- Portraits
- Available light
- Creative bokeh
Considerations
- Some vignetting wide open
- Softer corners at f/1.4
Optical Characteristics
Sharpness (wide)4/5
Sharpness (stopped)5/5
Contrast5/5
Flare Resistance5/5
CA Control4/5
Vignetting Control3/5
Distortion Control5/5
Bokeh: Smooth with 8 blades
Rendering: Classic fast 50 character
Color: Neutral, accurate
Common Issues
- Focus ring stiffness
- Sticky aperture blades
- Oil on blades
Buying Guide
Common and affordable. Check aperture operation carefully. More expensive than f/1.7 but worth it for the extra stop.
Specifications
MountPentax K
Focal Length50mm
Max Aperturef/1.4
Min Aperturef/22
Aperture Blades8
Min Focus0.45m
Filter Size49mm
Weight235g
Optical Design
FormulaDouble Gauss
Elements7
Groups6
CoatingSMC (Pentax)
Pricing
£60 - £120
Typical used price
Mint: ~£160
Good value fast standard
Adapts To
Sony EFujifilm XCanon RFMicro Four Thirds
Compatible Cameras
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Last verified: Jan 2026Report an error