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2026-07-12 - SMC Pentax-A f1.2 / 50mm Lens

 

The SMC Pentax-A f1.2 / 50mm Lens is an ultra-fast manual-focus standard prime lens produced by Pentax between 1984 and 2004. It represents the fastest aperture ever offered in the Pentax K-mount system.

Key Features:

  • Focal Length: 50mm
  • Maximum Aperture: f/1.2
  • Lens Mount: Pentax K
  • Optical Construction: 7 elements in 6 groups
  • Aperture Blades: 9 rounded blades
  • The "A" Advantage: Unlike earlier K and M lenses, the A series features electronic contacts on the mount. This allows the lens to communicate with a modern camera body, enabling automatic exposure modes (Program, Shutter Priority, and Aperture Priority) and matrix metering on compatible film and digital bodies.
  • SMC Coating: Features Pentax's famous Super Multi-Coating (SMC), which suppresses flare and ghosting while delivering highly praised, rich colour rendering.
  • Build Quality: Features a robust, all-metal barrel and an incredibly smooth manual focus ring with a long throw (~200°).
  • Filter Size: 52mm
  • Minimum Focus: 0.45m (1.5 ft)
  • Weight: ~345g


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