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SMC Pentax 50mm f/1.2
Pentax · 1975-1989
A legendary achievement in lens design. The world's first 50mm f/1.2 lens. Ultra-fast aperture for extreme low light and creative shallow depth of field. Highly collectible.
Known for
- Ultra-low light
- Creative shallow DOF
- Character portraits
- Collectors
Considerations
- Soft wide open
- Heavy vignetting at f/1.2
- Expensive
Optical Characteristics
Sharpness (wide)3/5
Sharpness (stopped)5/5
Contrast4/5
Flare Resistance5/5
CA Control4/5
Vignetting Control3/5
Distortion Control5/5
Bokeh: Legendary extreme blur
Rendering: Unique f/1.2 character
Color: Warm, atmospheric
Common Issues
- Focus ring stiffness
- Oil on blades
- Haze
Buying Guide
Rare and collectible. Check all elements for haze. Test aperture operation. Worth the premium for the unique rendering.
Specifications
MountPentax K
Focal Length50mm
Max Aperturef/1.2
Min Aperturef/22
Aperture Blades8
Min Focus0.45m
Filter Size52mm
Weight390g
Optical Design
FormulaDouble Gauss
Elements7
Groups6
CoatingSMC (Pentax)
Pricing
£300 - £600
Typical used price
Mint: ~£800
Collectible premium pricing
Adapts To
Sony EFujifilm XCanon RFMicro Four Thirds
Compatible Cameras
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Last verified: Jan 2026Report an error