Leitz 569 115 Plan 16x / 0.30 D Metallurgical

Description

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