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blog.microscopeworld.com/2011/09/microscope-condenser-and-aperture.html

The aperture diaphragm (also called an iris diaphragm) controls contrast, and is found in the condenser, which sits right below the stage in line with the microscope objectives. The condenser may be movable, both in the horizontal and vertical directions.

en.wikipedia.org/wiki/Condenser_(microscope)

The Arlow-Abbe condenser is a modified Abbe condenser that replaces the iris diaphragm, filter holder, lamp and lamp optics with a small OLED or LCD digital display unit. The display unit allows for digitally synthesised filters for dark-field, Rheinberg, oblique and dynamic (constantly changing) illumination under direct computer control.

answers.yahoo.com/question/index?qid=20130927144931AANKtDZ

What are the differences between iris diaphragm and condenser? ... What are the differences between iris diaphragm and condenser? ... A standard microscope has three, four, or five objective lenses that range in power from 4X to 100X. When focusing the microscope, be careful that the objective lens doesn’t touch the slide, as it could break ...

www.microscopeworld.com/t-trouble_microscope_condenser.aspx

Troubleshooting Microscope Condensers. ... In order to obtain Koehler illumination the microscope must have a collector lens and/or field lens, a field iris diaphragm, a condenser iris diaphragm and a condenser lens. When looking through the microscope the field iris should be adjusted when the magnification of the microscope is changed to ...

micro.magnet.fsu.edu/primer/anatomy/condensers.html

A simple two-lens Abbe condenser is illustrated in Figure 1. In this figure, light from the microscope illumination source passes through the condenser aperture diaphragm, located at the base of the condenser, and is concentrated by internal lens elements, which then project light through the specimen in parallel bundles from every azimuth. The ...

www.zeiss.com/.../basic-microscopy/field-iris-diaphragm-function.html

The field iris diaphragm, residing in a conjugate plane with the lamp collector lens, is imaged sharply into the same plane as the specimen by the microscope condenser. Images of both the field diaphragm and the specimen are formed in the intermediate image plane by the objective and are projected into the fixed field diaphragm of the eyepiece ...

www.olympus-lifescience.com/en/microscope-resource/primer/anatomy/condensers

A simple two-lens Abbe condenser is illustrated in Figure 1. In this figure, light from the microscope illumination source passes through the condenser aperture diaphragm, located at the base of the condenser, and is concentrated by internal lens elements, which then project light through the specimen in parallel bundles from every azimuth.The size and numerical aperture of the light cone is ...

www.quekett.org/resources/understanding/condensers-contrast

Home | Resources | Understanding the microscope | 6. Condensers and contrast. 6. Condensers and contrast The condenser – different types. Contrast in the microscope. In the previous article on the eyepiece, I pointed out that the eyepiece was normally located so that its front focal plane was co-incident with the Primary Image Plane (PIP). The PIP is conjugate with the specimen in the ...

www.microbehunter.com/the-condenser-aperture-diaphragm

In this post, the function of the condenser aperture diaphragm is explained. The purpose of the condenser is to concentrate the light onto the specimen, its diaphragm regulates resolution, contrast and depth of field. Many modern course microscopes are equipped with a condenser and an associated condenser diaphragm.

www.zeiss.com/.../basic-microscopy/condenser-aperture-diaphragm-function.html

The opening and closing of this iris diaphragm controls the angle of illuminating wavefronts that bathe the specimen (and thus the aperture size). Condenser height is controlled by a rack and pinion gear system that allows the condenser focus to be adjusted for proper illumination of the specimen.