Leitz NPL 20x / 0.40 Strain-Free Reflected

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