HL 50x / 0.65 BF / DF Metallurgical Microscope
$100.00
This Leitz objective is meant for use with the Modulopak vertical illuminators as found on Leitz microscopes of the 1980�s such as the Ergolux, as well as earlier stands equipped with the dark field vertical illuminator that could be interposed between the limb of the stand and the viewing tube. Even though these objectives are fitted with a standard RMS thread, they are able to take advantage of darkfield capability using a very novel means for illumination. The vertical illuminators (such as the modulopak) are fitted with an annular collector lens in the lower dovetail mount. The darkfield illumination, when selected, passes through this lens which focuses it to a point somewhere between the objective and the bottom of the illuminator. After passing this focal point, the hollow cone of light then expands whereupon it enters the periphery of the objective. Annular collector lenses in the objective then direct the light to a mirror element at the end of the lens which focuses the light onto the sample. The flared body of the objective allows the lenses to be threaded into fairly compact RMS nosepieces.
This particular objective is engraved HL 50x / 0.65 DF. It is an infinity corrected objective, and must be used without any coverslip. The HL designation indicates the lens is corrected for flatness of field when using standard diameter 23.2mm oculars with a field-of-view index of 18mm or less, and is of normal achromatic color correction. The objective is not spring-loaded so it must be used with care. Working distance is less than 0.5mm, but otherwise unknown.
Magnification � 50x
Numerical aperture � 0.65
Achromatic color correction
Nominally flat field-of-view for normal 18mm index oculars
Standard RMS thread
Dark field capable � must be used with Modulopak vertical illuminators for dark field
Infinity corrected
Cover glass correction � MUST be used without cover-glass
Leitz catalog number for this objective is 569 190. Cosmetically, the objective is in very fine condition, near mint. However, there is a small scratch on the front element (see third photo). The scratch is not imaged in the field-of-view, however, it may very slightly reduce contrast when looking at some specimens.
***MPN 569 190
***OEM Leitz
***SKU*** 30136
1 in stock
Description
Description
This Leitz objective is meant for use with the Modulopak vertical illuminators as found on Leitz microscopes of the 1980�s such as the Ergolux, as well as earlier stands equipped with the dark field vertical illuminator that could be interposed between the limb of the stand and the viewing tube. Even though these objectives are fitted with a standard RMS thread, they are able to take advantage of darkfield capability using a very novel means for illumination. The vertical illuminators (such as the modulopak) are fitted with an annular collector lens in the lower dovetail mount. The darkfield illumination, when selected, passes through this lens which focuses it to a point somewhere between the objective and the bottom of the illuminator. After passing this focal point, the hollow cone of light then expands whereupon it enters the periphery of the objective. Annular collector lenses in the objective then direct the light to a mirror element at the end of the lens which focuses the light onto the sample. The flared body of the objective allows the lenses to be threaded into fairly compact RMS nosepieces.
This particular objective is engraved HL 50x / 0.65 DF. It is an infinity corrected objective, and must be used without any coverslip. The HL designation indicates the lens is corrected for flatness of field when using standard diameter 23.2mm oculars with a field-of-view index of 18mm or less, and is of normal achromatic color correction. The objective is not spring-loaded so it must be used with care. Working distance is less than 0.5mm, but otherwise unknown.
Magnification � 50x
Numerical aperture � 0.65
Achromatic color correction
Nominally flat field-of-view for normal 18mm index oculars
Standard RMS thread
Dark field capable � must be used with Modulopak vertical illuminators for dark field
Infinity corrected
Cover glass correction � MUST be used without cover-glass
Leitz catalog number for this objective is 569 190. Cosmetically, the objective is in very fine condition, near mint. However, there is a small scratch on the front element (see third photo). The scratch is not imaged in the field-of-view, however, it may very slightly reduce contrast when looking at some specimens.
***MPN 569 190
***OEM Leitz
***SKU*** 30136
Additional information
Additional information
| Dimensions | 4 × 4 × 4 in |
|---|
