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Nikon PK13 Auto Extension Ring 27.5mm (55 Micro AI (1:1)

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

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Nikon PK13 Auto Extension Ring 27.5mm (55 Micro AI (1:1) 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-13 Auto Extension Tube allows a lens to focus closer than its normal set minimum focusing distance. The PK-13 provides 27.5mm of extension. The rings can be used alone or in combination.

An AI Nikkor will preserve automatic diaphragm and meter coupling functions, letting you compose, focus and meter at wide apertures. 

PK-13 Extension Tube can be used singly or in combination to vary the reproduction ratio of lenses from 20 to 300mm. It is mounted between the camera body and the lens. Through the lens exposure control automatially compensates for lens extension. Manual and aperture-priority auto-exposure control modes are possible Manual focus only.

KEH Specifications

  • Tube Length: 1.1" / 27.5mm
  • Weight: 3.5 oz / 100 g
  • Function: Offers extension for any Nikon SLR lenses longer than 50mm (or with a reverse 50mm lens using the reverse adapter). Extends focus of the lens and allows it to focus closer than the normal minimum focusing distance
  • Ratio: 1:1 (when used with Micro-Nikkor 55mm f/2.8 lens)
  • Note: The exposure meter will not work with the Nikon D90, D60, D3000, or D5000. G-type lenses are not able to be used with this extension tube.
  • Compatibility: AF-S lenses in Manual mode only


Physical Characteristics

Lens Mount Nikon F Mount Ai

General information

Brand Name Nikon
Product Model PK-13
Manufacturer Part Number 2653

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