Limits the amount of light and changes the depth of focus.
The diaphragm reduces the light from under the stage which can improve the image contrast.
The diaphragm reduces the light from under the stage which can improve the image contrast.
Equipped on the Condenser of the microscope, the iris diaphragm is a shutter controlled by a lever that is used to regulate the amount of light entering the lens system.
Regulates the amount of light entering the body tube...
Robert Hooke
A camera's diaphragm and your eye's iris perform the same function in the same way. They both control how much light is allowed through the lens by expanding and contracting.
The radial and circular muscles of the iris.
the iris
It is identical in action to the iris in your eye, it widens and narrows to allow only the required amount of light through the aperture hole/pupil
iris
function of iris diaphragm
The diaphragm, often called the "iris" diaphragm for its identical form and function to the iris in your eye, regulates the physical amount of light allowed to pass through a camera lens. It may be called the "iris," the "diaphragm," the "iris diaphragm," the "stop," or the "aperture." All mean the same thing.Physically, the diaphragm or iris diaphragm is made up of overlapping thin opaque metal plates, usually six or eight, which can be adjusted to increase or decrease the diameter of the hole, called the stop, in the center of the lens. The diaphragm is often located at the optical center of the lens between sets of elements. On manual cameras there is usually a ring around the lens barrel marked in f/stops for adjustment of the diaphragm.The iris (diaphragm) in your eye, working properly, automatically opens or closes in response to light level. When you are exposed to strong light the iris closes down (or "stops" down) to a smaller diameter, decreasing the light reaching your retina (equivalent to the film or sensor in your camera). In dim light, the iris opens up to admit more light. The diaphragm in your camera works the same way, and on modern cameras it's often equally automatic. You may never even notice it's working.In a camera, the iris diaphragm and the shutter have to work together to control the total exposure. The iris diaphragm controls the amount of light, and the shutter controls the amount of light over time. Depending on the make and model of the camera, shutter and diaphragm may be manual, automatic or both. The diaphragm is the mechanism that varies the size of the aperture; the opening that allows light into the camera.
The diaphragm reduces the light from under the stage which can improve the image contrast.
The diaphragm reduces the light from under the stage which can improve the image contrast.
The diaphragm reduces the light from under the stage which can improve the image contrast.
The diaphragm reduces the light from under the stage which can improve the image contrast.
Equipped on the Condenser of the microscope, the iris diaphragm is a shutter controlled by a lever that is used to regulate the amount of light entering the lens system.