SM-4 Series Stereo Microscope
AmScope Proprietary Page 31 of 37
Eyepieces
Eyepieces are also called ocular lenses. Eyepieces
come in many magnifications and you replace them
by swapping them out of the eyetubes.
The eyepieces magnify the specimen further from the
first magnification through the objective lens. Each
eyepiece is marked with 2 numbers. The first number is
the magnification and the second is the field of view.
For example, an eyepiece marked WF10/20 has a magnification of 10X
and a field of view of 20mm.
Eyetubes
Eyetubes are also called ocular tubes. Eyetubes house
the eyepieces and camera adapters.
You change eyepeices by removing them from the
eyetubes.
Field of View and Working Distance
Field of view is how much of the specimen you can see
through the eyepiece. The linear field of view of the
eyepiece is divided by the magnification of the objective.
The higher the magnification, the smaller the field of
view.
Working distance is the distance between the bottom of
the objective lens and the stage. You change the
working distance when you use the focusing knob.
Together, working distance and field of view determine
how much of the specimen you see and how closely.
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