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

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. To operate the tutorial, use your mouse cursor to drag the slider to open and close the field diaphragm.

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

Field Iris Diaphragm Function In the optical microscope, light emitted by the source (such as a tungsten-halogen or arc discharge lamp) is passed through a collector lens system in the lamphouse so that the filament or plasma ball can be focused onto the front focal plane of the condenser.

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

www.microscopyu.com/microscopy-basics/field-of-view

In modern microscope eyepieces, the field diaphragm either precedes the optical system or is located between the lens element groups, as illustrated in Figure 1.This figure presents cutaway diagrams of a Ramsden and Huygens eyepiece showing ray traces through the field lens, eye lens, and field diaphragm.

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.olympus-lifescience.com/.../primer/java/microscopy/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. To operate the tutorial, use your mouse cursor to drag the slider to open and close the field diaphragm.

en.wikipedia.org/wiki/Köhler_illumination

The field diaphragm is then partially closed; the edges of the diaphragm should be in the same conjugate image planes as the specimen, therefore should appear in focus. The focus can be adjusted by raising or lowering the condenser lenses and diaphragm. Finally, the field diaphragm is reopened to just beyond the field of view.

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.

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

Portable Microscope A cordless or field microscope with a light source independent of 110/220V. Typically, includes a rechargeable LED light source so that it can be used in the field where 110/220V electric supply is unavailable. Pointer