LOMO substage condenser. Numeric aperture is not marked. I suppose that it may be 1.25, but not sure. It features iris diaphragm, filter holder and biconvex lens. Standard mount diameter - 37mm.
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Review by Dushan Grujich
The LOMO Biolam condenser shown on the images is KOH-3 in Cyrillic or Latin KON-3, 1.2 aperture. The KON-3 was supplied as standard condensor with most of the LOMO Biolam 70 series microscopes. (Posted on 10/20/2012)