8
The iris diaphragm is not intended to control the brightness of the
illumination, but induce contrast of the specimen by diffracting light
rays.
7. Use the fine focus control to complete the focus and produce the
sharpest image.
8. For additional clarity, use the left eye diopter adjustment to correct the
differences between the user’s eyes. Set the adjustable left eye
diopter at zero. Then focus with the coaxial focusing knob, using your
right eye only (close your left eye). Now using your left eye only,
adjust the diopter ring until a clear image is seen (close your right
eye). The diopter adjustment is now set to the users eyes and will not
need to be adjusted again until a different user uses the microscope.
9. Now you can rotate the nosepiece to higher magnification objectives.
The objectives are parfocalized so that once the lowest objective
(4XD) is focused, only a slight turn of the fine focusing knob is
required when changing to 10XD, 40XRD and 100XRD objectives.
Oil Immersion
It is desirable to use immersion oil with the 100XRD objective. Oil
generates a fine resolution and brightness of the image viewed
through the microscope. Drop a tiny amount of oil (1 drop) onto
the slide prior to focusing with the 100XRD objective (between the
slide and the objective tip). It is essential to thoroughly clean the
objective tip after use. Please contact Swift Optical or your
authorized Swift dealer for the appropriate immersion oil to use.
IMPORTANT: The focal distance of the 100XRD and 40XRD
objective to the slide surface is very close and although the
40XRD objective is sealed to prevent immersion oil
contamination, it is a good practice to avoid dragging the 40XRD
objective through an oiled slide.
Objective
Immersion Oil
Glass Slide
