Fig. 6A: Olympus CX31 Microscope Iris Diaphragm

Theiris diaphragm control lever should be set at at around 0.9 for 1000X oil immersion microscopy. For lower magnifications, reduce the light level of the iris diaphragm. 

Gary E. Kaiser, Ph.D.
Professor of Microbiology
The Community College of Baltimore County, Catonsville Campus
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Last updated: August, 2017
Please send comments and inquiries to Dr. Gary Kaiser