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Chapter 3 Individual Operations
3.11 Adjusting the Field Diaphragm
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3.11
Adjusting the Field Diaphragm
The field diaphragm restricts illumination to the
area of the specimen that is being viewed.
Operating the field diaphragm control changes the
size of the field diaphragm. For normal observation,
the size of the diaphragm should be such that it is
just outside the edge of the viewfield.
If a broader area than necessary is illuminated,
stray light will enter the optical system, creating
flaring, reducing the contrast of the optical image,
and expanding the area of color fading of the
specimen. Appropriate field diaphragm settings are
particularly important for photomicrography and
digital image capturing.
In general, good results will be obtained by
stopping down the field diaphragm to settings
slightly wider than the area to be reproduced within
the photo frame or monitor display.
*
For the field diaphragm of the epi illuminator,
refer to “3.16 Episcopic microscopy.”
3.12
Setting a Filter on the Field Lens
You can attach a filter of 45 mm diameter into the filter pocket of the field lens part (beneath the
condenser). (option)
Filter Application
NCB 11 (color balancing filter)
For color balance adjustment and color photomicrography
ND 16 (transmittance: 6%)
For brightness adjustment
GIF
For retardation measurement and contrast adjustment
Field diaphragm control
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