Nikon Nikkor M2 macro 55mm lens adapter

Nikon M2 Extension Tube for 55mm Lens

$18.00 CAD
$18.00 CAD

WHAT CONDITION THE CONDITION IS IN: 88-Day Confirmed Operation Warranty. Clean and pristine. Some minor wear marks, only noted for full disclosure. Scroll down if you want to learn about the design, performance, and story behind it. Or don’t. It’ll be here either way.

There's something almost monastic about the Nikon M2 Extension Tube. It’s a hollow metal cylinder, 27.5mm of pure intention, containing absolutely nothing, which is precisely the point.

Born in Japan during the late 1960s, when Nikon was building things as though they expected to be judged by posterity (they were right), the M2 was engineered as a devoted companion to the 55mm Micro-Nikkor lenses. It nudges them from a polite 1:2 reproduction ratio to a full, unflinching 1:1. That is life-size, no apologies, and no glass inside to muddy the truth.

It weighs around 100 grams, fits like a firm handshake, and will almost certainly outlast your grandchildren. Does it change the focal length? It does not. It simply moves the lens farther from the sensor or film, which is the optical equivalent of leaning in closer to hear a secret. It does cost you two stops of light at 1:1, which is the universe's tax on intimacy.

And mind the AI coupling tab on certain DSLRs, or the M2 will remind you, in the bluntest mechanical terms, that it predates such courtesies. It was eventually replaced by the more diplomatically evolved PK-13.

Today it's beloved for film scanning, landing 35mm negatives in perfect 1:1 framing with an almost eerie exactness, as if it always knew that its highest calling wasn't capturing the world, but preserving it.

Technical Specifications
  • Extension Length: 27.5 mm optical extension
  • Physical Dimensions: 35.5 mm total length, 61.5 mm outer diameter, 115 g weight.
  • Optical Construction: 0 elements / 0 groups
  • Magnification Range: Converts 55mm Micro-Nikkor lenses from 1:2 (0.5×) up to true 1:1 (life-size reproduction).
  • Working Distance at 1:1: ~5.8 cm from front lens element to subject
  • Light Loss: 2 full stops
  • Aperture Control: Retains automatic spring-loaded diaphragm coupling
  • Metering: No AI or rabbit-ear meter coupling; requires stop-down metering or manual exposure.
  • Compatibility: Native on pre-AI vintage film bodies; 100% compatible on mirrorless bodies via dumb adapters; check mount clearance on modern DSLRs with fixed AI indexing tabs.
  • Lineage: Followed the original Nikon M ring; replaced in 1977 by the AI-coupled Nikon PK-13.