Use Of Darkfield Darkfield; Use Of Phase Contrast (Phase Contrast Models Only) - Swift STELLAR 1 Series Instruction Manual

an aperture diaphragm closed down to 2/3 of the maximum value.
Color Coded Condenser Aperture Diaphragm
Turning down the diaphragm will lower the resolution and brightness but
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The aperture diaphragm is coded in color ranges to quickly locate
increase the contrast and depth of focus.
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aperture diaphragm of by matching objective color ring.
An image with appropriate contrast in most cases can be obtained with
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Turn the aperture diaphragm to the corresponding range of the objective
an aperture diaphragm closed down to 2/3 of the maximum value.
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color ring. For example,red range for 4x.
Adjust the aperture diaphragm slightly to get the sharpest image
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according to specimens.
Color Coded
Aperture
Diaphragm
Turn the aperture diaphragm to the maximum position.
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position.
Turn the light intensity wheel as necessary to increase brightness.
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10. Use of Phase Contrast (Phase Contrast models only)

A phase contrast model contains condenser with slot, phase contrast
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slide with phase annulus, phase contrast objectives with built-in phase
plate, and a phase centring telescope for aligning.
Turn the phase contrast objective into position.
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4X 10X 40X 100X
Darkfield
13
White
Blue
Yellow
Red
4X 10X 40X
Objective Color Ring
100X