Unusual microscope objective

Unusual microscope objective

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19 March 2025 at 19:13 #789603
old mart
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Trawling ebay as usual, I chanced upon an objective which doesn’t make sense to me.

It is a Cooke 8X 0.2 oil. I have a 40 X, 90X and several 100X oil, but only 8X?

The vendor cannot get it to focus, and the ebay number is 186906405232.
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