Olympus CH2-DS Darkfield Central Stop. It is used for simple and efficient observation of specimens in darkfield, the CH2-DS is a valuable accessory. It works well with both low and medium-power objectives.

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The Olympus product number is 6-LB251. This unit is in new "un-opened" condition. Even though this product was made specifically for the Olympus CH2 it will work on essentially every microscope that could fit the 35mm disk into the lower part of the condenser.