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

 

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M-Ring

M-Ring.jpg
A female F-Bayonet; male F-Bayonet; 27.5mm extension; automatic diaphragm coupling; not meter coupled. This is the tube matched with the 55mm auto-diaphragm macros; when added to them, it provides continuous focussing from 1:2 to 1:1. The first version has the effective aperture etched on it, for a lens with no helical extension.

M2 Ring

M2 provides an extension of 27.5mm but DOES NOT preserve any automatic features. This is the tube matched with the sensatinal original 55mm Micro-Nikkor f/3.5 which when used in conjunction with this companion accosry would make the famed macro lens enabling extension of continuous focusing from ratio 1:2 to life size 1:1.

mringoptic.gif M2Ring.jpg
The working distance from lens to subject after mounting at 1:1 is only 2.3 inches. It is almost a must to collector to get this accessory for the matched auto-diaphragm macro.

It is a female F-Bayonet; male F-Bayonet; 27.5mm extension; automatic diaphragm coupling; not meter coupled.

Extension Tube PK-1

female F-Bayonet; male F-Bayonet; 8mm extension; automatic diaphragm coupling; non-AI meter coupled

This is a nice little tube which is more convenient to use than the K1 or A rings because it retains both aperture and meter coupling. On the other hand, it doesn't offer quite as short an extension as the K1 and will damage AI cameras without a flip-up lever (Nikkormat FT3, FE, FM, F3, F4, F5 with modification).

Extension Tube PK-2

female F-Bayonet; male F-Bayonet; 14mm extension; automatic diaphragm coupling; non-AI meter coupled

This tube offers the same amount of extension as the older E rings, but without the added plunger-diaphragm, so these are most useful for lenses mounted normally. It will damage AI cameras without a flip-up lever (Nikkormat FT3, FE, FM, F3, F4, F5 with modification).

Extension Tube PK-3

female F-Bayonet; male F-Bayonet; 27.5mm extension; automatic diaphragm coupling; non-AI meter coupled

viewinfof2aflw2.jpg
This tube offers the same amount of extension as the older M rings, and is meter-coupled, to boot. Thus, it is well-matched to 55mm auto-diaphragm Micros. However, it will damage AI cameras without a flip-up lever (Nikkormat FT3, FE, FM, F3, F4, F5 with modification). For non-Al lenses, it serves exactly the same purpose as AI-enabaled PK-13.

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Both rings preserve automatic aperture and fullaperture metering when used with the appropriate lens and camera combination.

Extension Tube PN-1

female F-Bayonet; male F-Bayonet; 52.5mm extension; automatic diaphragm coupling; non-AI meter coupled; built-in rotating tripod collar

PN11.jpg
This tube is matched with the older 105f/4 Micro and offers continuous focussing (when mounted) from 1:2 to 1:1. With the 105f/4 racked out to 1:1, the entire combination is quite impressively long. With the 105f/2.8 Micro AI-S, it offers focussing slightly beyond 1:1 (because that lens shortens its focal length as you focus closer). It also has a nice rotating tripod collar which helps the mounting of the 105mm tremendously. It will damage AI cameras without a flip-up lever (Nikkormat FT3, FE, FM, F3, F4, F5 with modification).

Extension Tube PK-11

A female F-Bayonet; male F-Bayonet; 8mm extension; automatic diaphragm coupling; AI meter coupled.

PK-11.jpg
This is a nice little tube which is more convenient to use than the K1 or A rings because it retains both aperture and meter coupling.

On the other hand, it doesn't offer quite as short an extension as the K1 although now it has the AI meter coupling.

Extension Tube PK-12

A female F-Bayonet; male F-Bayonet; 14mm extension; automatic diaphragm coupling; AI meter coupled

PK-12.jpg
This tube offers the same amount of extension as the older E rings, but without the added plunger-diaphragm, so these are most useful for lenses mounted normally. Now it offers AI meter coupling.

Extension Tube PK-13

female F-Bayonet; male F-Bayonet; 27.5mm extension; automatic diaphragm coupling; AI meter coupled

PK13.jpg
This tube offers the same amount of extension as the older M rings, and is meter-coupled, to boot. Thus, it is well-matched to 55mm auto-diaphragm Micros. Now it offers AI meter coupling.

Extension Tube PN-11

female F-Bayonet; male F-Bayonet; 52.5mm extension; automatic diaphragm coupling; AI meter coupled; built-in rotating tripod collar

PN-11.jpg
This tube is matched with the older 105f/4 Micro and offers continuous focussing (when mounted) from 1:2 to 1:1. With the 105f/4 racked out to 1:1, the entire combination is quite impressively long. With the 105f/2.8 Micro AI-S, it offers focussing slightly beyond 1:1 (because that lens shortens its focal length as you focus closer). It also has a nice rotating tripod collar which helps the mounting of the 105mm tremendously. It is now AI meter coupled.

This tube is quite favorable to use with longer IF lenses, such as the 300f/4.5 (sometimes along with the PK-13) to get a lens with unparalleled close-up working distance.

BR-1 (1a) Rangefinder Adapter Ring

female S-Bayonet; male F-Bayonet; 62.3 mm extension (?); not diaphragm coupled; not meter coupled

BR-1tube.jpg
I am not sure if this is the same as the N-F tube used to adapt the old rangefinder telephotos (180/2.5, 250/4, 350/4.5, 500/5, 1000/6.3 reflex) to the F-bayonet mount. The N-F tube provided the appropriate amount of extension required to focus these lenses to infinity (as they'd been designed for the rangefinders' reflex housing). The BR-1 was used exclusively on the 135f/4 Bellows lens in conjunction with the Bellows 2.

Since the Bellows 1 was designated for the rangefinder series (again, with the reflex housing), the BR-1 probably also provided the correct amount of extension required to focus the lens to infinity with a camera and bellows mounted. (I have heard it occasionally called the B-F tube ...)

It was later updated (along with the Bellows 2) to the BR-1a (and Bellows 2a) to be compatible with the Cordless Pack. Nikon added 3mm of extension to the rear standard of the Bellows 2 to make the 2a clear the extra bulk of the Cordless Pack, and correspondingly subtracted 3mm from the BR-1 to make the BR-1a.

BR-2 Macro Reversing Ring

BR-2.jpg
A male 52mm filter thread; male F-Bayonet; not diaphragm coupled; not meter coupled. This ring will mount a lens with 52mm thread in reverse on a bellows. The BR-5 is similar, but works for 62mm-threaded lenses. The BR-2 was later updated in the autofocus era so that its male F-bayonet would not interfere with the AF contacts in the body.

BR-3 Adapter Ring

A female F-Bayonet; female 52mm filter thread; not diaphragm coupled; not meter coupled. Older ring is shown at the bottom right.

BR3.jpg OlderBR3.jpg
This ring was originally intended for attaching the slide-copying attachments to a reversed lens (This is for reversing a standard Nikkor lens for use with the bellows, it is a macro adaptor ring for Bellows focusing attachment model 2), but it makes for a dandy way to fit filters to the exposed rear element of a reversed lens.

Early versions are all chrome-colored, while later ones have a black plastic filter-thread piece (and a metal bayonet).

BR-4 Semiauto Diaphragm Ring

A female F-Bayonet; male F-Bayonet; 9mm extension; semi-automatic diaphragm coupled; not meter coupled

This ring provides for a semiautomatic diaphragm when used with Bellows units. Apparently, it is spring-loaded so that the diaphragm is held open without any pressure from one end of a double-cable release, but stops down to the appropriate aperture when the release is squeezed.

BR-6 Semiauto Diaphragm Ring

BR-6autoring.jpg
A female F-Bayonet; male F-Bayonet; 9mm extension; semi-automatic diaphragm coupled; not meter coupled; Apparently, this is an updated BR-4.

F-Mount EL-Nikkor Adapter

Female Leica thread; male F-Bayonet; This adapter allows the Leica-threaded EL-Nikkor enlarging lenses to be mounted to the bellows units.

F-Mount EL-Nikkor Reverse Adapter

Male 40.5mm? thread; male F-Bayonet; This adapter allows the Leica-threaded EL-Nikkor enlarging lenses to be mounted in reverse to the bellows units. I am not sure, but I think it is only the 50mm and 63mm EL-Nikkors (then again, Nikon made several 50mm EL-Nikkor variants ...)

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| Extension Rings & Tubes Part I & Part II | Bellow Units Part I, Part II, Part III | Close-Up Attachment lenses | Microscope Adaptors | Copy Stands | Medical / Bellows Nikkor | Cable Releases | Cases & compartments | Eyepiece Accessories | DH-1 Charger | Miscellaneous | Micro-Nikkor Lenses | Macro flash Units |

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Recommended links to understand more technical details related to the Nikkor F-mount and production Serial Number:
http://rick_oleson.tripod.com/index-153.html by: my friend, Rick Oleson
http://www.zi.ku.dk/personal/lhhansen/photo/fmount.htm by: Hansen, Lars Holst
http://www.mir.com.my/rb/photography/hardwares/nikonfmount/lens2.htm
http://www.photosynthesis.co.nz/nikon/serialno.html

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Copyright © 2000. leofoo ®. MIR Web Development Team.

In memory of my friend Com. Augusto Staut, Brazil, 1971-2000.

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; hawkeye.photographic.com 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 Corner.com.), 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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