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Nikon PK11A Auto Extension Ring 8mm AI

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* Item pictured for illustrative purposes only, actual item not pictured.

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Nikon PK11A Auto Extension Ring 8mm AI Description


Nikon Auto Extension Rings PK and PN fit between the camera body and lens either individually or in combination. The extension rings have no optics. The PK and PN rings are used in manual focus mode and are considered non-CPU lens attachments. The PK-11A provides 8mm of extension. The AI Nikkor will preserve automatic diaphragm and meter coupling functions, letting you compose, focus and meter at a wide apertures.

KEH Specifications

  • Function: Designed for closer focusing than normal set minimum focusing distance
  • Compatibility: Any Nikon SLR lens longer than 50mm or with reversed 50mm lens used with a reverse adapter
  • Length: 0.3" (8mm)
  • Weight: 1.8 oz  (50g)
  • Note: Use of step-down rings can cause vignetting




Nikon SLR lenses - Longer than 50mm

Physical Characteristics

Lens Mount Nikon F Mount Ai

General information

Brand Name Nikon
Product Model PK-11A
Manufacturer Part Number 2656

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