This mount is used on polarization microscopes as far as I know. For example, I can see it on MIN-10 microscope in my reference book (see the scan).

To work correctly, it requires special clamping mechanism (not included - should be a part of your microscope).

Such adapter allows two things - to change an objective quickly, and to center it prefcectly by means of that spring-loaded mechanism and two adjusting screws in the adapter.

Adapter thread is RMS (0.8″, 36 tpi).

More Information

More Information
Adapter Front Side	RMS
Adapter Rear Side	Other mount
Material	Bronze
Manufacturer	LOMO
Advantages	Design: Many of our products were inspired by customers, and have great application value. Material: Aluminium alloy 2024 (used in aviation and space industry). It is light and durable. Technology: Cutting from solid bars provides the highest possible product quality. Tolerances: A bit tight fit is better than too loose fit for imaging equipment.

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RMS/DIN Quick Change objective mount adapter for Polarization microscopes

Design: Many of our products were inspired by customers, and have great application value.
Material: Aluminium alloy 2024 (used in aviation and space industry). It is light and durable.
Technology: Cutting from solid bars provides the highest possible product quality.
Tolerances: A bit tight fit is better than too loose fit for imaging equipment.