This objective is part of the series of metallurgical lenses for reflected light examination of samples in the materials sciences. The objective is corrected for uncovered samples and this must be adhered to strictly. The tubelength correction accommodates the extra length required by the various types of vertical illuminators. Characteristics include:.
.
Magnification � 20x
Numerical aperture � 0.40
Tube length � 215mm
Non flat-field achromatic correction
Objective thread � RMS standard

The lenses are designed for work in incident light brightfield. They are in excellent cosmetic condition and superb optical condition.

***MPN
***OEM Bausch & Lomb (B&L)
***SKU*** 32213

This objective is of achromatic correction and intended for routine biological examinations. It was meant for use with the American Optical Series 10 / 20 instruments, but will also work with the later Series 110 / 120 microscopes. It is infinity corrected.

Magnification � 10x
Numerical aperture � 0.25
Objective thread � RMS standard
Not flat-field
Achromatic correction
Catalog number 1076

The lens is in excellent cosmetic condition and perfect optical condition.

Photo set 2015
***MPN 1076
***OEM American Optical (AO)
***SKU*** 32208

This is a Wild Heerbrugg MTr2 6v 30w Regulating Transformer.

*** *Please note that the lamp socket is NOT included with the transformer � it was photographed only to demonstrate the working condition of the transformer. ***

This is a nice regulating 6-volt transformer as supplied for several of the vintage Wild stereo microscopes. There are two output taps on the rear of the transformer which allow one to power a pair of 15w lamps or a single 30w lamp. The transformer is continually adjustable with the power switch integral with the intensity setting knob. A pilot lamp indicates that the power is on, and there is a volt meter for repeatable settings of lamp intensity. The output is continually adjustable. It is identical in most respects with the Model MTR 16 transformer, however it was originally supplied with a two-wire line cord. That has been replaced with a three-wire cord that has been internally grounded in a similar fashion to that of the MTR 16. The transformer also lacks the tap for a 250v primary line.

Characteristics include:

Input line selector 110 / 125 / 150 / 220 V
Secondary 30 vA
50 or 60 cycle line current..

BMI Surplus, Inc. has a huge inventory of used, new, pre-owned, recycled and refurbished Microscope Parts for sale.
We will work with you individually to find the perfect set up for your application…

Buy online or give us a call at 781-871-8868. We have experienced customer service representatives standing by ready to help you!

BMI Surplus, Inc. is a dealer in used and sometimes new Surplus Scientific & Industrial Equipment – we cater to clients in search of items to be used for specific applications.
We do not offer a guarantee as many of our items are purchased by professionals in need of parts and pieces.
You will find many of our items listed on our website as untested or as parts or repair units even though in they are in good used condition.

**Shipping, Handling & Freight fees are dependent on your location.
We will provide a freight quote to meet your individual needs and work with you if you prefer to use your own carrier.
We have 32 years of experience shipping sensitive scientific instruments & industrial equipment!

Don’t see what you are looking for? Use our orange search box on the top right hand corner of this page to customize your search.

***MPN MTr2
***OEM Wild Heerbrugg
***SKU*** 31382

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 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 � 16x
Numerical aperture � 0.30
Objective thread � 30mm
Infinity corrected
Should be used without coverslip, but observation of coverslipped samples is possible in transmitted light.
Working distance � 6.9mm

This lens is one of the better series of 30mm thread lenses, 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 16x, which makes this the lowest power in the Plan series (the others included 32x and 80x). 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 100x magnification with this particular objective.

These are infinity corrected optics, but the numerical aperture is low enough (0.30) with this objective that it is not sensitive to the presence of a cover glass. The objective is not spring-loaded, but the working distance is fairly substantial at 6.9mm. Glass is in flawless condition, and cosmetic condition is near-perfect. Leitz catalog number is 569 115.

Photo set 1964
***MPN 569 115
***OEM Leitz
***SKU*** 30168

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