Nikon M2 Extension Ring

The Nikon M2 extension ring was introduced in the 1960s as part of Nikon’s precision macro system for their F-mount SLR cameras. Designed specifically to extend the capabilities of close-focusing lenses like the Micro-Nikkor 55mm f/3.5, the M2 ring brings the lens to true 1:1 (life-size) magnification while preserving full aperture control and meter coupling on cameras like the Nikon F equipped with a Photomic finder.

When the Nikon M2 Extension Ring is paired with my early Nippon Kogaku version of the 55mm Micro lens, the M2 ring becomes a minimalist and historically correct tool that allows me to photograph small wildflowers and natural textures at life-size scale without introducing additional complexity or bulk.

If you enjoy building a clean, vintage macro system and want to see how these classic tools perform in real-world field work, consider joining my Darkroom Diary Premium Membership for exclusive articles, live walkthroughs, and field-tested insight.

Nikkor F M2 Extension Tube - timlaytonfineart.com

Nikon M2 Extension Ring – Accessory Profile

General Information

Accessory Name: Nikon M2 Extension Ring
Accessory Type: Manual extension tube (non-AI)
Mount Type: Nikon F-mount (pre-AI compatible)
Manufacturer: Nippon Kogaku (Japan)
Original Release Date: Mid-1960s
Purpose: Extends lens-to-film distance for achieving higher magnification with compatible lenses
Primary Pairing: Micro-Nikkor 55mm f/3.5 (to achieve 1:1 magnification)

Physical Specifications

Length: 27.5mm
Mounting: Nikon F bayonet on both sides (camera and lens ends)
Build Material: All-metal construction with matte black finish and engraved markings
Aperture Coupling: Yes – maintains full mechanical linkage between lens and camera body
Meter Coupling: Fully compatible with Nikon F Photomic finders via rabbit ears on mounted lens

Nikon M2 Extension Ring by Tim Layton - timlaytonfineart.com

Optical Impact with Micro-Nikkor 55mm f/3.5

Native Lens Performance (no M2):

  • Maximum magnification: 1:2 (half life-size)
  • Closest focusing distance: approx. 9.5 inches (24 cm)

With M2 Extension Ring:

  • Maximum magnification: 1:1 (life-size)
  • Closest focusing distance: approx. 8 inches (20 cm)
  • Working distance is close, but usable in natural light with careful approach
  • Lens becomes a dedicated macro tool while mounted—infinity focus is lost

Exposure Compensation at 1:1

At 1:1 magnification (achieved with M2 on the 55mm Micro), 2 stops of exposure compensation are required due to light loss from extension.

Compensation Guide:

  • If using a handheld meter: meter normally, then open up 2 stops
    • e.g., If the meter reads f/11 → shoot at f/5.6
  • If using a Photomic finder: Nikon F metered prisms do not auto-correct for extension, so apply the same +2 stops manually

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Practical Use & Field Notes

  • Stability is key at 1:1—tripod use is recommended, though handheld shots are possible with fast film and strong light
  • Depth of field is extremely shallow at close distances—compose carefully
  • Works best with static subjects, such as wildflowers, plant textures, bark, and found objects
  • For a fully mechanical, battery-free macro setup on the Nikon F, this pairing is ideal

Collector & Usage Notes

The Nikon M2 ring is part of the classic modular Nikon system from the golden era of mechanical SLRs. It’s simple, effective, and historically correct for photographers using the Micro-Nikkor-P 55mm f/3.5 lens. Many modern macro setups rely on autofocus and complex flash systems, but for those who prefer the slow, intentional process of analog close-up work, the M2 ring transforms the 55mm Micro lens into a powerful life-size rendering tool that feels timeless in use.

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