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2026-04-20 - Tokina RMC P-KA Doubler (Pentax)

The  Tokina RMC P-KA Doubler is a 2x teleconverter designed specifically for Pentax K-mount cameras. It effectively doubles the focal length of any attached lens—for example, turning a 135mm lens into a 270mm lens—at the cost of two full stops of light transmission (e.g., an f/2.8 lens becomes an f/5.6).and a slight reduction in overall sharpness. 

 

Key Features:

  • Mount Compatibility: Specifically designed for Pentax P/KA (K-mount). The "KA" designation typically indicates support for aperture signaling, allowing for "Program" and "Aperture Priority" modes on compatible Pentax bodies.
  • Optical Design: High-quality 7-element construction, which is superior to the more common 4-element doublers of that era.
  • Coating: Features Tokina’s RMC (Ray Multi-Coating) to help reduce flare and improve contrast.
  • Build: Robust all-metal body, typically made in Japan.
  • Dimensions: Compact size, approximately 64 x 46 mm (2.5" x 1.8") and weighs about 212g. 


 

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