Fig. 3A: 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. 

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Microbiology Laboratory Manual by Gary E. Kaiser, PhD, Professor of Microbiology
is licensed under a Creative Commons Attribution 4.0 International License.
Last updated: August, 2017