15
4.2.
Binocular Tube
I. Diopter Adjustment
Diopter adjustment compensates for differences in vision between
the left and right eyes. In addition to making observation through
both eyes easier, this adjustment also reduces the extent to which
focusing is lost when the objective magnification is changed. In
particular, this occurs when a low magnification objective is used.
In the case of a polarizing microscope, an eyepiece containing
cross-line is used for the right eye; the procedure for adjusting the
diopter differs from that of an ordinary microscope.
Turn the diopter adjustment ring on the right eyepiece to bring the
cross-line in the eyepiece into focus.
Next, focus on a specimen while viewing with the right eye, and
then turn the diopter adjustment ring on the left eyepiece and
bring specimen into focus.
II. Interpupillary Distance Adjustment
Before adjusting the interpupillary distance, bring a specimen into
focus using the 10x objective.
Adjust the interpupillary distance so that both the right and left
field of view become one.
This adjustment will enable the user to observe the specimen with
both eyes
Interpupillary distance scale
