MS Plan 20 Metallurgical Microscope Objective

Description

This listing is for an Olympus metallurgical (or semi-conductor) microscope objective. The objective is in flawless condition. I could detect no blemishes either in the optical system or on the objective housing.

The objective is of recent vintage (mid-1990’s), and is corrected for use with infinity tube-length vertical illuminators. Important attributes of the objective can be summarized as follows:

20x magnification
0.46 numerical aperture
Corrected for infinity relay lenses with a back focal length of 180mm
Insensitive to cover glass
S Plan designation indicates fully flat field including 26.5mm oculars
3.10mm free working distance
45mm adjustment length (distance from specimen plane to objective thread seat)
Standard RMS thread (0.80 inches)
NOT suited for dark field
IC designation indicates suitability for Nomarski Interference Contrast or polarized light applications

The objective is suitable for use with the infinity vertical illuminator as found on the later BHM series instruments, as wsell as the Vanox II and III, the PME 3 and PMG 3 inverted metallographs, and the STM measuring microscopes. I am unsure about suitability to the more recent and current instruments. Olympus catalog number is 1-LM540T.

Photo set 1674

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***MPN 1-LM540T
***OEM Olympus
***SKU*** 23092