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Nine-blade iris Pentacon 2.8/135 lens with 15-blade iris Aperture mechanism of Canon 50mm f/1.8 II lens, with five blades In the human eye, the iris (light brown) acts as the diaphragm and continuously constricts and dilates its aperture (the pupil) A 750nm titanium-sapphire laser beam passing through an iris diaphragm, while opening and closing the iris.
Condensers typically consist of a variable-aperture diaphragm and one or more lenses. Light from the illumination source of the microscope passes through the diaphragm and is focused by the lens(es) onto the specimen. After passing through the specimen the light diverges into an inverted cone to fill the front lens of the objective.
The T-mount is a solely mechanical specification. Electrical or mechanical connections (such as for autofocus) are generally not provided, although Sigma's YS Mount featured an automatic diaphragm coupling. Besides cameras, T-mounts are used in optical breadboard prototyping components as well as telescope and microscope attachments. The T ...
A bright-field microscope has many important parts including; the condenser, the objective lens, the ocular lens, the diaphragm, and the aperture. Some other pieces of the microscope that are commonly known are the arm, the head, the illuminator, the base, the stage, the adjusters, and the brightness adjuster.
In optical microscopes a darkfield condenser lens must be used, which directs a cone of light away from the objective lens. To maximize the scattered light-gathering power of the objective lens, oil immersion is used and the numerical aperture (NA) of the objective lens must be less than 1.0. Objective lenses with a higher NA can be used but ...
Most later lenses produced for Exaktas (Ihagee did not make their own lenses), known either as "automatic" or "semi-automatic" lenses, included a button in an extension that would align over the camera body's shutter release when the lens was mounted. The diaphragm of these lenses remained fully open, providing a bright viewfinder image, until ...
Köhler illumination is a method of specimen illumination used for transmitted and reflected light (trans- and epi-illuminated) optical microscopy.Köhler illumination acts to generate an even illumination of the sample and ensures that an image of the illumination source (for example a halogen lamp filament) is not visible in the resulting image.
The Yashica Pentamatic, an advanced, modern 35 mm Single Lens Reflex (SLR) camera with a proprietary bayonet-mount, automatic diaphragm (offered only with the Auto Yashinon 50mm/1.8 lens), and interchangeable lenses, was introduced in 1959. As before, Yashica continued to source its lenses from the Tomioka Optical factory.
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