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micro.magnet.fsu.edu/primer/java/microscopy/diaphragm/index.html

Field Diaphragm. The field diaphragm controls how much light enters the substage condenser and, consequently, the rest of the microscope. Instructions about how to use this tutorial appear below the window.

zeiss-campus.magnet.fsu.edu/tutorials/basics/fielddiaphragm/indexflash.html

When the microscope is properly configured for Köhler illumination, the field diaphragm is imaged in the same conjugate plane as the specimen, and in fact, all of the image-forming conjugate planes are simultaneously imaged into each other and can collectively be observed while examining a specimen in the eyepieces.

www.reference.com/science/diaphragm-microscope-5b8449bd1d0ad451

A diaphragm on a microscope is the piece that enables the user to adjust the amount of light that is focused under the specimen being observed. A diaphragm is typically found on higher-power microscopes versus less expensive or toy models. The diaphragm is located directly under the stage or platform where user places the specimen or slide.

micro.magnet.fsu.edu/primer/java/kohler/condenseradjust

Field Diaphragm Opening Size. This tutorial demonstrates how the condenser is centered in the optical path and the size of the field diaphragm opening is determined when adjusting a microscope for proper Köhler illumination. Operating instructions appear just below the tutorial window.

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

When the microscope is properly configured for Köhler illumination, the field diaphragm is imaged in the same conjugate plane as the specimen, and in fact, all of the image-forming conjugate planes are simultaneously imaged into each other and can collectively be observed while examining a specimen in the eyepieces.

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

Anatomy of a Microscope - Substage Condensers; ... When the condenser is used without its top lens, the aperture iris diaphragm is opened wide and the field diaphragm, now visible at the back of the objective, serves as if it were the aperture diaphragm. Flip-top condensers are manufactured in a variety of configurations with numerical ...

www.biology.ualberta.ca/facilities/multimedia/uploads/alberta/define.pdf

Field Diaphragm Control - The base of the microscope contains the field diaphragm. This controls the size of the illuminated field. The field diaphragm control is located around the lens located in the base. Fine Adjustment Knob - This knob is inside the coarse adjustment knob and is used to

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

Field diaphragms are useful to adjust for correct microscope alignment, but are not always included in less expensive microscope models. 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.

www.microscopeworld.com/t-trouble_microscope_condenser.aspx

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 ensure an evenly lit sample. Using Filters

www.microscope.com/education-center/microscopes-101/microscope-terms

A microscope designed with the objectives under the stage and the light source above. Used for viewing larger specimens, often in containers. Iris Diaphragm Found on high power microscopes under the stage, the diaphragm is, typically, a five hole-disc with each hole having a different diameter.