Nikon ECLIPSE E200 POL Instructions Manual page 25

The settings of each part in orthoscopic microscopy and conoscopic microscopy are
summarized below.
Purpose of
observation
Top lens of the
condenser
Bertrand lens
Aperture
diaphragm
9
Swing-Out the Top Lens of the Condenser
The top lens of the swing-out condenser can be
moved outside the optical path with the swing-out
knob.
During normal orthoscopic microscopy or
conoscopic microscopy, the top lens is used while
positioned in the optical path. During orthoscopic
microscopy using a low-power objective of 4x or
lower, swing out the top lens.
During measurement of retardation or evaluation
by interference color, swing out the top lens (the
condenser aperture diaphragm may be stopped
down) and illuminate with light that is as parallel to
the optical axis as possible.
10
Filters
Filters of φ45mm can be placed on the top of the field lens.
IV Microscopy (Detailed Procedure)
Orthoscopic Observation
To investigate the vibration direction
and birefringence of observation
light by observing the extinction and
interference color due to the
specimen.
10x or
IN
higher
4x or
OUT
lower
OUT (Turret position: O)
70 - 80% of the
10x or
numerical aperture
higher
of the objective
4x or
Fully opened
lower
23
Conoscopic Observation
To distinguish between uniaxial
and biaxial properties and
observe the optic-axial angle
and optical characteristics in
minerals.
IN
IN (Turret position: B)
Circumscribed the
circumference of the
conoscopic viewfield (or fully
opened)
Top lens
IV
Swing-out knob