Iris Diaphragm
The iris diaphragm in the optics carrier of your M series microscope has the same purpose as those in a camera shutter: it regulates the avail- able light, which changes the depth of field. The "depth of field" (or "depth of focus") is the area of a specimen that is brought into sharp focus.
Closing the iris diaphragm
★★ Close the iris diaphragm by turning the knob to the left. The subject appears darker and the depth of field increases.
Opening the Iris Diaphragm
★★ Open the iris diaphragm by turning the knob to the right. The subject now appears brighter, but the depth of field decreases.
Leica M series | User Manual | 38 |
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