This is a special relay lens assembly designed for adapting CCD video cameras to various microscope phototubes ports. This particular system consists of four separate elements. The main portion is the relay lens housing itself, which has a tube factor of 0.55x. This allows the camera to encompass a significantly larger portion of the field of view as seen in the binocular tube than would be possible when not using any relay lens. The upper portion is threaded to accept interchangeable camera mounts. Included is a two-part adapter for Sony bayonet mount cameras (ENG 12). This adapter has a locking sleeve which may be used to parfocalize the camera CCD plane to the image in the binocular tube.

The lower portion of the relay adapter tube accepts a series of different clamp tubes used to fit the relay lens to the various microscope phototubes. The included clamp tube is not identified by type letters, but its dimensions are as follows. I believe it is a type BMX suitable for Olympus BX series phototubes.

Length (not including bottom annular dovetail) � 127mm
Dovetail diameter � 42mm
Dovetail height � 5.8mm
Overall diameter of clamp tube base � 59.75mm

The relay system is in excellent condition.

Photo set 2005
***MPN
***OEM Diagnostic Instruments
***SKU*** 30198

This Leitz objective is intended for work in the materials sciences – it is part of a series of objectives computed for use without coverglass using brightfield reflected light illumination. The objective is infinity corrected, so it MUST be used with an infinity correction tube lens, such as found in most Leitz metallurgical vertical illuminators.

Magnification � 20x
Numerical aperture � 0.35
Standard achromat (not flat field)
Objective thread � standard RMS
Adjustment length � 45mm
MUST be used without cover slip

The objective is in very fine condition. No blemishes could be seen in the glass. It dates from the late 1960’s to early 1970’s.

Photo set 1970
***MPN
***OEM Leitz
***SKU*** 30174

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 � 20x
Numerical aperture � 0.40
Achromatic color correction
Flat field for normal wide-field oculars (index 18mm)
Free working distance � 2.3mm
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 cell shows some very light discolorations (see photos).

Photo set 1968
***MPN 559 202
***OEM Leitz
***SKU*** 30172

This is a very nice Leitz objective designed for use with their bright-field / darkfield illuminators that accept 30mm diameter threaded lenses. These illuminators included the MM-5 and MM-6 metallographs (the MM-5 requires special change rings for the 30mm thread); and the darkfield illuminators that fit the Ortholux I (Metallux I), Ortholux 2 (Metallux 2), and Orthoplan (Metalloplan) microscopes. The Ortholux II illuminators will also fit the Diavert (Epivert) microscopes. These objectives will not work with later style Modulopak illuminators � the thread is incompatible and the design of the darkfield annular illumination path differs.

Magnification � 80x
Numerical aperture � 0.75
Objective thread � 30mm
Infinity corrected
Must be used without coverslip
Working distance � 0.18mm

This lens is a member of the �high-end� series of 30mm thread objectives, being corrected for flatness of field across a 28mm field-of-view index. It can be used with the super-wide field of view oculars. Magnification is 80x, which makes this the highest power in the Plan series (the others included 16x and 32x). These magnifications were selected by Leitz to provide part of the ASTM standard series when used with the �wide-field� versions of the vertical illuminators (0.8x tube lenses) and GW 8x oculars. That combination yields the 500x magnification with this particular objective. Numerical aperture is 0.75.

These are infinity corrected optics and must be used without a cover glass. The objective is not spring-loaded, so great care should be exercised when using the lens. Working distance is a mere 0.18mm! This particular lens is in fantastic cosmetic and optical condition. Concave front element is flawless. Leitz catalog number for this lens is 569 117.

***MPN 569 117
***OEM Leitz
***SKU*** 30169

This Leitz microscope objective was intended for the examination of metallurgical or semiconductor samples..It is corrected for a flat field of view when using standard GF (GrosFeld) oculars, hence the Normal PLan or NPL engraving. PL objectives were intended to be flat over the entire 28 mm field of view of the super-wide-field Orthoplan and large metallographs – the NPL’s are most suited for the 18 mm to 20mm field of view.

Magnification � 5x
Numerical aperture � 0.09
Achromatic color correction
Flat field for normal 18mm oculars
Standard RMS thread
Adherance to zero coverslip not manditory
Adjustment length � 45mm
Working distance � 6.2mm (?)
Infinity corrected

The objective is infinity corrected as can be told by the ‘X’ mark following the magnification. While it is intended for samples without cover glass, the numerical aperture is small enough that it could be used in transmitted light with covered samples. It would still need to be employed in conjunction with an infinity corrected system, however. Attempting to use this optic with a 170 or 160 mm tube length system would introduce all manners of aberrations!

The lens is in superb condition – no scratches and the coatings are very strong. The lens dates from the early 1980’s since it rhas the relatively coarse knurl next to the thread seat.

Photo set 1962

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***MPN
***OEM Leitz
***SKU*** 30166

This is an earlier version of the Leitz NPL infinity strain-free objective for use in polarized light applications. The P designation means that it is critically free of strain and therefore suitable for use in ore microscopy applications. The lens is ‘short-mounted’ and may be threaded into centering collars for use with pol vertical illuminators. It is also suitable for combination with a Wollaston prism for Nomarski interference contrast applications.

Magnification � 20x
Numerical aperture � 0.40
Infinity corrected
NPL � flat field-of-view for standard 18mm index oculars
Must be used without a cover slip
Not spring-loaded � care should be exercised when focusing and scanning samples

The cosmetic condition of the lens is excellent, however, the front element does have a flaw. There are three voids in the coating, one of which is quite elongated � possibly from being used with a laser. The defect is only within the coating � the underlying glass is fine, and no internal damage could be detected within the elements.

Photo set 1977
***MPN
***OEM Leitz
***SKU*** 32448

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