Nikon Trinocular Viewing Tube with Modified Photo Port

This appears to be a conventional Nikon trinocular viewing head for the Optiphot series of microscopes that has been modified by Optical Specialties for use on one of their instruments. The binocular portion of the system is unchanged, as is the diverter prism for choosing between the observation portion of the tube and the photo tube.

However, the phototube has an extensive modification. The upper portion of the tube has a permanently-fitted sleeve along with a small relay lens system recessed within the tube. The annular dovetail for mounting the tube on the microscope stand is unaltered.

This tube was used with a special image rotation system (available separately). Cosmetically the tube is in great condition except for a couple of chips in the enamel of the base (see third photo). This may be used as a great source of spare parts to restore a damaged tube, or one could invest in a new diverter prism enclosure to bring it back to factory original condition. The optics are in perfect condition.

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***MPN
***OEM
***SKU*** 23047

This is a GW 6.3x ocular for use in the ‘super-wide-field’ viewing tubes as found in the Leitz Orthoplan and MM-5 and 6 research microscopes. It is the original ‘chimney’ style with the tapered chrome barrels. The ocular was removed from the large projection screen built into an MM-5 research metallograph. As a consequence of its location, it was never touched – the glass is perfect as are the cosmetics. The Locktite that had been used to secure the eye lens in the proper position for screen focus has been removed and new Leitz lubricant applied to the helical threads. For all practical purposes, the lens is in ‘unused’ condition. Focus motion works perfectly.

The ocular has a barrel diameter of 30mm and a field-of-view index of 28mm (this is the diameter of the observed object field when using a 1x objective).

Photo set 1607
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***OEM Leitz
***SKU*** 23029

This is a matched pair of a15x oculars. These oculars are ONLY useable in the Leitz series of binocular magnifiers. These magnifiers resembled inverted porro-prism binoculars and were supplied in three variations with fixed magnification objective lenses (0.7x, 1x, and 2x). They are unique in that the diameter of the ocular tube is 31mm (instead of the more common 30mm), and the length of the two ocular tubes differed. The left-hand tube would only accept the ‘fixed’ eyelens ocular, and the right tube the focusing ocular. Consequently, the shoulders on the two types of oculars were in different positions. Oculars were always supplied in pairs with one fixed and one adjustable eyelens.

These magnifiers were first produced in the 1920’s, and production continued in one form or another until around 1980. Around 1970 Leitz changed the tube diameter to the more conventional 30mm, so if you have a very recent magnifier, you should double-check to make sure this ocular will fit! (These are the 31mm version).

To illustrate the difference in the two ocular tubes I have shown a pair of a15x oculars installed in a c. 1950 binocular magnifier. (It is not included in this listing and is not available for purchase).

The lenses are in exceptional condition – just some very light wear in the enamel on the focusing knurls. The glass is in unblemished condition and appears to have a mag-fluoride coating although it is very pale. From the engraving style, I would date these oculars to the late 1950’s.

Photo set 1605
***MPN
***OEM Leitz
***SKU*** 23027

This 10x Nikon ocular is intended for use in the simpler stereo microscopes. It has a barrel diameter of 30mm. It does not include an eye guard. The ocular is in good cosmetic condition – there is an ‘8’ scribed into the side of the barrel, and the nomenclature shows a bit of wear although still readable. The glass appears to be perfect. Field-of-view index is 20mm – this is the diameter of the object field that is observable when the objective magnification is set to 1x.

The upper eyelens is fixed. This ocular does not include the adapter ring to install reticles. This listing is for a single eyepiece.

Photo set 1599
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***OEM Nikon
***SKU*** 23021

This 15x Nikon ocular is intended for use in the simpler stereo microscopes. It has a barrel diameter of 30mm. It does not include an eye guard. The ocular is in superb condition – even the printed nomenclature on the front bezel is strong. The glass appears to be perfect. Field-of-view index is 14mm – this is the diameter of the object field that is observable when the objective magnification is set to 1x.

The upper eyelens is fixed – these oculars do not accept reticles. This listing is for a single eyepiece.

Photo set 1598
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***OEM Nikon
***SKU*** 23020

This ocular has a 30mm diameter sleeve and may only be employed in the super-wide field viewing tubes. The magnification is 10x, and the field-of-view index is 26.5mm (this is the diameter of the field one would see if using a 1x objective). The ocular is focusable.

The ocular is in near-perfect condition. The glass appears to be blemish-free. This appears to be an earlier version of the CFUW ocular – it does not include an integrated rubber eye guard. The focusing mount is very different from the later versions. I am not sure about compatibility with the later types.

***MPN
***OEM Nikon
***SKU*** 23015