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Disc diaphragm

The disc diaphragm is a microscope component located beneath the specimen stage that serves to regulate the amount of light passing through the observed specimen into the objective lens. It is a rotating disc containing several apertures of different diameters. By rotating this disc, the user selects which aperture will be in the light path, thereby changing the illumination intensity in steps. A smaller aperture lets through less light, which increases image contrast and the depth of field—the range in which the specimen is in focus. This is particularly useful when observing transparent or unstained specimens, as it helps highlight details. Conversely, a larger aperture lets through more light, which is required at higher magnifications or for dark specimens. The disc diaphragm is a simpler version of the "iris diaphragm," which, unlike the disc diaphragm, does not allow for continuous, but only stepped light regulation.

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