This is a used pair of Bausch & Lomb stereo microscope oculars. They are intended for use in the StereoZoom series of instruments. They are of earlier manufacture, having the red-engraved nomenclature on the clear anodized aluminum barrels.

Magnification � 20x
Eye relief � 9mm
Barrel diameter � 23.2mm
Field-of-view index � 12mm (diameter of object field when microscope zoom set to 1x)

These oculars are in very fine optical condition, but cosmetically I would rate them somewhere between ‘fair’ and ‘good’. There are some identification marks engraved in the barrel, and the clear-coat anodizing shows some deterioration. The upper black-anodized bezels are very worn. The base of the barrels have slight crimps from having been dropped. The crimps come nowhere near interfering with the image (the diaphragms are quite small compared to the diameter of the barrel). However, it does mean that unthreading the diaphragms in order to mount reticles will most likely not be easy, if even possible (see second photo).

Photo set 1946
***MPN
***OEM Bausch & Lomb (B&L)
***SKU*** 30151

Bausch & Lomb Ocular Pair 20x StereoZoom Microscope

This is a gently used pair of Bausch & Lomb stereo microscope oculars. They are intended for use in the StereoZoom series of instruments. They are of earlier manufacture, having the red-engraved nomenclature on the clear anodized aluminum barrels…

Magnification � 20x
Eye relief � 9mm
Barrel diameter � 23.2mm.
Field-of-view index � 12mm (diameter of object field when microscope zoom set to 1x)

The oculars are in perfect optical condition and range between excellent and mint in cosmetic condition.

***MPN 31 15 64
***OEM Bausch & Lomb (B&L)
***SKU*** 30152

This objective is infinity corrected and intended for use in reflected light examinations. It may also be used successfully in transmitted light applications provided it is used with an appropriate infinity corrected vertical illuminator. The lens is very sensitive to cover glass correction and MUST be employed without any cover-glass on the specimen. The red-filled nomenclature denotes that it is reasonably free of strain. As such, it may be used for non-critical ore microscopy examinations, or as a component in an interference contrast setup..

Magnification � 50x
Numerical aperture � 0.85
Highly corrected for color (Fluotar rare-earth glasses)
Flat field for normal wide-field oculars (index 18mm)
Free working distance � 0.24mm
Objective thread � standard RMS
Infinity corrected
Cover glass correction � no cover-glass
Low-strain for polarized light applications
Adjustment length � 30mm (see explanation below)

The 30mm adjustment length of this objective warrants some explanation. Being an infinity corrected optic, the distance from the tube lens within the microscope to the objective is freely adjustable. This lens may be threaded directly into the individual centering collars as used on the pol vertical illuminators. The short 30mm adjustment length allows the examination of thicker preparations. When used on a nosepiece with DIN standard 45mm objectives, a 15mm spacer should be employed (not included). When employing Nomarski interference contrast, the objective is threaded into a special intermediate adapter that carries a Wollaston prism (catalog number 553 395). This prism is listed separately.

This lens is in superb condition without any blemishes noted in the glass elements. The lens elements are spring-loaded for objective and specimen protection.

Photo set 1936

***MPN 559 223
***OEM Leitz
***SKU*** 30141

This is an excellent condition pair of 8x microscope oculars from the Japanese manufacturer Unitron. They are engraved ‘W 8x’ and feature a wide field of view with a relatively high eyepoint. They fit the normal 23.2mm diameter eyepiece tubes. The upper eyelenses are fixed and these are not designed to accept micrometer reticles. It should be noted that Unitron microscope oculars are not suitable for use with their telescopes.

The eyepieces are in excellent condition � there is very little wear to the black lacquer of the front bezels. One of the oculars has some abrasions to the chrome tube (see photo). The glass is in perfect condition and has MgFl coatings.

Photo set 1890
***MPN
***OEM Unitron
***SKU*** 30095

Unitron Microscope Eyepieces Lot of 6.

This is an interesting assortment of vintage Unitron microscope oculars. There are six oculars in total, including two paired and two single magnification lenses. Both of the paired oculars have focusing eyelenses, while the two ‘singles’ have fixed upper elements.

The oculars include:

Paired R 5x lenses, marked ‘Bi’. While these do have focusing eyelenses, they do not appear to accept reticles. They are very long (see photo).

Paired Ke 10x ‘Micrometer’ eyepieces with focusing eyelenses. Both oculars include a carrier for reticles, and there is a micrometer plate numbered ‘0’ to ’10’ and divided into 100 parts installed in one of the carriers. The other carrier is empty.

Ke 15x single ocular, also marked ‘Bi’.

K 20x single ocular, also marked ‘Bi’.

All of the eyepieces are of the standard 23.2mm diameter. None are high-eyepoint, nor do they have coated lens elements. The glass is excellent in all of the eyepieces. The chrome is in very decent shape in all except the 20x, which shows some brassing. The black paint on the bezels shows wear on all of the lenses, although not significant. The Ke 15x has obviously been dropped � the lip of the front bezel is turned down in a couple of places (see fourth photo). These optics probably date from the early 1960’s.

Photo set 1889

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***MPN
***OEM Unitron
***SKU*** 30094

This is a Semprex large-travel microscope stage that has been adapted to a stage carrier for a Leitz Orthoplan (or Ortholux 2) microscope. The stage features an excursion range of 4.25 inches in both the X and Y directions (ungraduated). The entire top plate moves so the sample does not ride back and forth on the upper plate. The stage has a glass insert so it may be used with transmitted light applications throughout the range of motion. The glass plate is about 2.5mm thick, so the substage condenser should have at least a 4mm working distance upper element (the L4 type 005 element as used with the type 600 condenser base). The stage carrier has a dovetail to accept a condenser carrier, but neither the condenser carrier or condenser are included.

The Semprex stage features a very innovative drive system. There are no rack & pinion assemblies. Instead, each axis is supplied with a tapered blade. The drive knobs have a pair of compression washers that engage the edge of the blade. The drives are completely free of backlash and there is absolutely no lost motion in the knobs. It is a very elegant system.

The stage appears virtually unused. The upper surface is unblemished. The glass is completely unmarked

BMI Surplus, Inc. is your best resource for microscopes and microscope components. We will work with you individually to find the perfect microscope for your application. For the most competitive pricing contact us by phone or click the purple �Ask us a question�� link above. We look forward to working with you!
***MPN
***OEM Semprex Corp
***SKU*** 30108

This is a nice matched pair of 10x oculars from a Swift model Eight-Eighty stereo microscope. They are engraved ‘W 10x � 18MM’ The glass is in perfect condition and the barrels have not been abused. The black anodized upper portions of the oculars do exhibit a bit of fading, and there are a couple of very light scratches in the anodized finish (see photo). Diameter is 23.2mm � these are not the wider type of ocular with the 30mm barrel.

***MPN
***OEM Swift
***SKU*** 30086

This fairly early achromat objective is engraved ‘Zeiss Winkel’ which would indicate a manufacture date shortly after the end of WW2. It is very good condition with a bit of wear to the crowns of the black lacquer on the attachment knurling. The magnification color band (red) is very strong and uniform � unusual for this vintage lens. The glass is in excellent condition.

Magnification � 4x
Numerical Aperture � 0.10
Achromatic correction
160mm tube length
Adjustment length � 45mm?

Photo set 1878
***MPN
***OEM Zeiss
***SKU*** 30083

This is a specialized objective that is intended for the small Zeiss semiconductor comparison microscope. The objective thread is much smaller than the normal RMS thread (13.5mm diameter with a 0.35mm thread pitch). This objective also has an extension tube that is 34mm long. There are no optics in the extension tube.

The objective is engraved with an infinity symbol, slash, 1.5. This would indicate it was intended to look at pattern geometry on semiconductor masks, with the substrate facing the objective (1.5mm thick glass).

Magnification � 10x
Numerical aperture � 0.20
Corrected for flat field imaging
Special attachment thread
Tube length – Infinity
Unknown adjustment length

The objective is in very good condition. There is a very small chip at the edge of the front lens concavity (please see second photo).

Photo set 1877
***MPN 46 20 92
***OEM Zeiss
***SKU*** 30082