This extension tube is one half the focal length of the standard Nikon 55mm camera lens. It may be used for 1:1 close-up photography with the 55mm Micro-Nikkor while maintaining auto-diaphragm coupling. The tube does not have the more recent (AI) meter coupling. It should not be used with later AI cameras (the PK-13 tube should be used instead).

The tube is in excellent (almost mint) condition.

Photo set 2037
***MPN PK-3
***OEM Nikon
***SKU*** 32230

This is a tube clamp adapter for Diagnostic Instruments CCD camera coupler. The camera couplers are designed to accept interchangeable couplers for the various manufacturer’s instruments. The type of coupler is not marked on this clamp which indicates it to be of earlier manufacture.

Critical dimensions of the coupler are as follows:

Upper tube assembly is 54.8mm tall and 49mm in diameter at the base of the flange. The lower portion of the tube is 37mm in diameter and 31mm tall. This diameter fits the most recent of the Leica Microsystems research microscopes as well as several of the stereo microscopes and later versions of their Macroscopes.

The tube is in excellent condition, but is missing two of the three set screws used to secure it to the relay assembly.

Photo set 2011
***MPN
***OEM Diagnostic Instruments
***SKU*** 32204

This is an unusual relay system for adapting a Sony-type bayonet mount video camera to Leitz microscope phototubes. The adapter includes a relay optic (magnification factor not stated) in a threaded helical cell inside the bayonet mount at the top of the tube. The bottom portion of the adapter is designed to slip over the 40mm diameter upper portion of the Leitz eyepiece phototube adapter (either the standard 23.2mm type or the larger 30mm GW adapter is suitable). The relay lens is to be used in conjunction with an appropriate Leitz ocular.

No manufacturer is stated, but there is a serial number on the side of the unit (1110). The unit is nicely made and in excellent condition.

Photo set 2008
***MPN
***OEM Custom
***SKU*** 32201

This is a Custom WF20X/11 Widefield Eyepiece (2) for Microscope 30.0mm.
Specifications:
– Model: X2AEL120J
– Magnification: 20X
– Field of view: 11mm
– Mounting size: 30.0mm in diameter
– Fit stereo microscopes M421 and M428
***MPN WF20/11
***OEM Custom
***SKU*** 33059

Unit is a Wild Heerbrugg microscope post with table clamp.
Specifications:
-Diameter: 1.5″
-Lenght: 12″.

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***MPN
***OEM Wild Heerbrugg
***SKU*** 31434

This is an interesting antique triple position revolving nosepiece. It is marked ‘Spencer Lens Company’ which dates it before the mid-1930’s takeover of that firm by the American Optical Company. The nosepiece has the standard RMS threads in all positions. The detent mechanism is very interesting and unique. At each threaded objective position a steel rod with a slot has been inserted through a bore on the periphery of the nosepiece. An internal spring arrests the nosepiece at each stop position. The nosepiece has a fixed RMS thread for attachment to various microscope tubes with a nickel-plated collar used to lock the nosepiece in the proper orientation.

The nosepiece is in excellent condition. There is some minor wear in the black lacquer finish, but the detent spring is strong with very positive stops at each position. This would date from the late 1920’s to early 1930’s.

Photo set 1992
***MPN
***OEM Spencer
***SKU*** 30185

This is a very scarce quadruple revolving nosepiece with the provision for centration of each of the objectives. This is particularly useful when employing a rotating stage and it is desired to have the axis of stage rotation perfectly centered within the field of view. It is also invaluable in certain metrollogy applications. The detent is via a spring-loaded ball-bearing. The objective threads are standard RMS. This nosepiece was designed for installation on the modular microscope bodies after removing the single-position spacer ring. The threaded attachment collar also uses an RMS thread allowing the nosepiece to be installed on other microscope tubes.

The nosepiece is in perfect condition with very strong detents and no discernible wear.

Photo set 1991
***MPN
***OEM Bausch & Lomb (B&L)
***SKU*** 30184

This is a Wollaston prism in a special 15mm long spacer adapter. It converts a 20x NPL (or NPL Fluotar) objective of 30mm adjustment length into a Nomarski interference contrast objective. The adapter is first threaded into the nosepiece, then the objective threaded into the adapter, forming a DIN standard 45mm adjustment length system. The three set screws about the perimeter of the adapter are released which allows the objective (along with the Wollaston prism within the adapter) to be axially rotated. When the shear direction is in the proper orientation with respect to the crossed analyzer and polarizer, the set screws are fixed.

Other elements needed for interference contrast include an analyzer slider with a fixed orientation polarizing filter, a special rotating polarizer / first-order red combination that is specific to the stand on which it is employed, and of course, the 20x objective. The prism is in perfect condition. The chrome plated cell shows some very minor discolorations.

Photo set 1967
***MPN
***OEM Leitz
***SKU*** 30171