Modern Classic SLR Series
Macro/Close-up Photography with Nikon F2 Series bodies
Extension Rings and Tubes


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Quick and easy extension explanation: When I say X1: X2, I mean that X1 is the feature size on the film, and X2 is the physical feature size, e.g. 1:3 implies that an object that is 30mm long will be reproduced as an image 10mm long on film.

ratio3.jpg ratioillus.jpg
Another way of expressing this is through the [mag ratio], which is the magnification ratio in use, i.e. a picture taken at 1:2 has a [mag ratio] = 0.5; a picture taken at 1:1 has a [mag ratio] = 1.0; a picture taken at 2:1 has a [mag ratio] = 2.0, etc.

It is easy to determine the [mag ratio] for a given lens (used in normal, unreversed position) and a set amount of extension. Without any extension in the lens's focussing helical (ie lens set to infinity):-

[mag ratio] = (amount of added extension)/(lens's focal length)
It's useful to know that bellows factor gives
(effective aperture) = (set aperture)* (1 + [mag ratio])

when calculating what the effect of your tube on the scene you're trying to meter.

Auto Extension Rings PK and PN and older Ring/Tubes

Key advantage of Extension Ring/Tubes is their compact size and lightweight, Auto Extension Rings slide on or off your camera in seconds for a wide range of reproduction ratios. There are 4 various current types available. PK-11A, PK-12, PK-13 and PN-11. Some older versions are also compiled in thi site for cross reference.

Extension rings can be used singly or in combination to vary the reproduction ratio of lenses from 20 to 300mm. They are mounted between the camera body and the lens. As a rule, the effect becomes stronger the shorter the focal length of the lens in use, and the longer the focal length of the extension ring. Through-the-lens exposure control automatically compensates for lens extension. Manual and aperture-priority auto-exposure control modes are usually possible with newer ones. All these rings/tubes featured here are for Manual focus only.

Note: Extension Ring PK-11A (8mm); PK-12 (14mm); PK-13 (27.6mm); (PK-13 when used with manual focus 55mm f/2.8 Micro-Nikkor, 1:1.6 to 1:1 are possible, while the PN-11 will go life size 1:1 with the manual focus 105mm Micro Nikkor f2.8 and f4)

These extension rings will provide a easy way to compose, focus and meter at the brightest, fullest aperture position without having to manually stop down the lens before shooting. These rings also allow automatic exposure control. Extension Ring such as PN-11, the longest extension in singular use, when used in conjunction with a 105mm f/4.0 or f/2.8 version of the manual focus Micro-Nikkor lenses will convert the 1:2 maximum reproduction ratio of the prime lens into 1:1 life size magnification.

Depends very much on your photographic requirement, with each of these group of accessories, various degree of magnification ratio can be achieved. You may use the guide below as a reference to choose the most appropriate setup for your close up photography.











Close-up attachment lenses:

1:27X - 1:2.6X

AUTO Extension Rings

1:6.5X - 1.1X

PB-6 (normal mounting):

1:l.lX - 4.0X

PB-6 (reverse mounting):

1.1X - 3.9X

PB-6 + PB-6E:(reverse mounting)

1.8X - 8.4X

Note: 'X' means multiple. Different magnification ratio is achieved when used in conjunction with different lenses. The highest magnification ratio achievable with a Nikkor lens is a 20mm in inverse mounting position (use in combination with a Bellow), of which 23X magnification is possible.

Some information compiled by Micheal Liu featuring older Extension Rings and Tubes produced by Nikon:

Original Extension Ring Set (A, B1, B2, C, D)

A: female F-Bayonet
male F-Bayonet
5.8mm extension
B2: female F-Bayonet
male thread
5.8mm extension
B1: female thread
male F-Bayonet
5.0mm extension
C: female thread
male thread
10mm extension
D: female thread
male thread
20mm extension

lens + A + body == 5.8mm extension
lens + B2 + B1 + body == 10.8mm extension
lens + B2 + B1 + A + body == 16.6mm extension
lens + B2 + C + B1 + body == 20.8mm extension
lens + B2 + C + B1 + A + body == 26.6mm extension
lens + B2 + D + B1 + body == 30.8mm extension
lens + B2 + D + B1 + A + body == 36.6mm extension
lens + B2 + C + D + B1 + body == 40.8mm extension
lens + B2 + C + D + B1 + A + body == 46.6mm extension

This was an early version of the Extension Ring Set K, and shares its features and drawbacks.

Extension Ring Set K

This consists of five tubes, fairly logically named K1, K2, K3, K4, and K5. They are not meter-coupled. They do not preserve the automatic diaphragm.

K1Ring.jpg KRingset.jpg
They are fairly versatile, and offer a generous range of extension, even if they are a bit fiddly. Only the A tube may be used without combining with any of the others.

female F-Bayonet

male F-Bayonet
5.8mm extension
female thread

male F-Bayonet
5.0mm extension
female F-Bayonet

male thread
5.8mm extension
female thread

male thread
10mm extension
female thread

male thread
20mm extension

On each of the other tubes, the "male thread" will mate with the "female thread" and so, in combination, offer the following extensions:

lens + K1 + body == 5.8mm extension
lens + K3 + K2 + body == 10.8mm extension
lens + K3 + K2 + K1 + body == 16.6mm extension
lens + K3 + K4 + K2 + body == 20.8mm extension
lens + K3 + K4 + K2 + K1 + body == 26.6mm extension
lens + K3 + K5 + K2 + body == 30.8mm extension
lens + K3 + K5 + K2 + K1 + body == 36.6mm extension
lens + K3 + K4 + K5 + K2 + body == 40.8mm extension
lens + K3 + K4 + K5 + K2 + K1 + body == 46.6mm extension

Nikon's Comments: The [...] versatile Extension Ring Set K consists of five rings which are used individually or in various combinations to get a variety of magnifications. The rings can be used with any lens from 20mm to 300mm. The set comes in a leather case.

E Semi-auto Extension Ring A female F-Bayonet; male F-Bayonet; 14mm extension; plunger-operated diaphragm coupling; not meter coupled

I'm not sure how this is different than the E2 -- perhaps it is a remake on the order of the M to M2 ring. At any rate, you can also use this ring when a lens is reversed on bellows to provide for a semi-automatic diaphragm without the extra cost/bulk of a dual-cable release.

E2 Semi-auto Extension Ring

female F-Bayonet
; male F-Bayonet; 14mm extension
plunger-operated diaphragm coupling; not meter coupled

Nikon's Comments: The E2 Ring adds an extension of 14mm to the lens and has a built-in plunger that is pressed to open the lens diaphragm to full aperture for bright viewing and focussing. Releasing the plunger stops down the lens to taking aperture.

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Tele-Converters: TC-1 | TC-2 | TC-200 | TC-201 | TC-300 | TC-301 | TC-14 | TC-14A | TC-14B | TC-14C | TC-14E | TC-16 | TC-16A | TC-20E


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Recommended links to understand more technical details related to the Nikkor F-mount and production Serial Number: by: my friend, Rick Oleson by: Hansen, Lars Holst

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Credit: Chuck Hester, US for his patience, encouragement and help to setup the various content in this site; Robert Johnson for some of his original images on the F2H-MD appeared in this site; my ex-staff, KiaSu for his superb 3-D logo appeared in this Nikon F2 site; Marc Vorgers from Holland who generously provide me with some of his images of F2AS; MCLau®, who has so much time with me to re-edit the content in this site and not to mention buying a Nikon Coolpix 990 just for this site. Keat Photo, Kuala Lumpur for providing their Nikon F2A to take some images for this site; again, Mr Edward Ngoh the great camera collector who provides us his collection of F2AS with MD-2; for their images on the Speed Magny film backs; Sean Cranor for his image on Nikon F2 25th Anniversary Model; Ted Wengelaar®, Holland for his continuous flow of input on some of the early Nikon bodies; CYLeow ® , photo editor of the Star newspaper, Malaysia for some of his images used in this site. Ms Rissa Chan, Sales manager from Shriro Malaysia who has helped to provide some of the very useful input. HiuraShinsaku®, Nikomat ML, Japan for some of his images on various F2 models; my staff, Wati, Maisa, Mai and my nephew, EEWyn®, who volunteered and helping me did so many of the film scanning works. Contributing photographers or resellers: Jen Siow, Foo KokKin, Arthur Teng, Mark Fallander, John Ishii, Ed Hassel, YoonKi Kim, Jean-Louis, M.Dugentas (Dell, Mr "Arsenall" and a few images mailed in from surfers with no appropriate reference to their origin. Dedicated to KU Yeo, just to express our mutual regrets over the outcome of a recent corporate event. Made with a PowerMac, broadcast with a Redhat Linux powered server.

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