Microscope marking objective

Microscope marking objective

This topic has 7 replies, 4 voices, and was last updated 20 October 2024 at 21:15 by old mart.

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20 October 2024 at 14:10 #760319
old mart
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@oldmart
I have just bought a small job lot of microscope related bits on ebay and this unusual objective was amongst them.

Made by Carl Zeiss of Jena, it is marked OBEKTMARKIERER PLANOBJEKTIVE TUBUS with an infinity symbol. The tip looks like carbide and is not dead sharp, but has a tiny radius, and it can be offset from central to about 4mm diameter, calibrated in 0.25mm steps. The whole lower part can rotate and has a rest position and cams downward about 0.5mm when turned. A specialised tool for marking metal surfaces with a ring, it is not sharp enough to mark glass without breaking it
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20 October 2024 at 15:44 #760339
Roderick Jenkins
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@roderickjenkins93242
Interesting!
20 October 2024 at 15:59 #760344
Michael Gilligan
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@michaelgilligan61133
VERY nice !

… I have a Nikon one, but it uses ink and is nowhere near in that league.

MichaelG.
20 October 2024 at 17:01 #760358
old mart
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@oldmart
I’ve no idea what I would do with it, the first photo shows a thin red ring showing when the tip is extended for marking.
20 October 2024 at 17:23 #760365
Michael Gilligan
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@michaelgilligan61133
I have just found its twin listed here:

https://www.ebay.de/itm/284579952041

MichaelG.
20 October 2024 at 18:09 #760368
old mart
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@oldmart
I hardly think it is worth a fraction of 130 euros, the market will be tiny.
20 October 2024 at 21:05 #760408
peak4
Participant
@peak4
I wonder if it should be sharp, and has been rounded by misuse/wear, or is a blank awaiting sharpening?
Here’s an example with a diamond point, intended for marking cover slips on slides, so the observer can find something of interest again later.
https://microscope-antiques.com/watsonom.html

Bill
20 October 2024 at 21:15 #760411
old mart
Participant
@oldmart
That Watson with the diamond point is spring loaded, the CZ is not, and would be hazardous if a brittle surface was touched. I will have a look at the tip at about 20-50X and report on the exact profile.
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