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6
Identification markings on the objecti'ves
(Fig.
5)
1 Mechanical tube
lengt
h
The di
stance
in mm from
th
e objective
shoulder
to the edge
of
the
tube.
2
Cover
glass
The
engraving
0.17
is
the
thick ness o
f th
e
covergl
ass.
A
dash
(-)
instead of
a
number
indi
ca
tes th at the
objective
can
be
used
for
s pecimens
with
o
r
without a
coverglass.
3 Field
Oatness
of
th
e
objective
EF
objectives
are
systems with a more or less
flat fi
e
ld
of
view
of
up
to 18 mm intermediate image diameter.
PLAN
objectives ar
e sys tems
with
a
flattened fi eld of vi ew up
to
22.5
mm
intermedia
te
image
di
ame
ter.
Fig.
5 Objectiv
e
identification
If
there
is
no
indica
tion
of
field fl attening,
the objective
is
an
achromat
with optimum
correction,
for
use
with up
to
18
field
of
view index.
4 Reproduction
sca le
in the int
ermediate image
Size
ratio
be
tween the intermediate image and the object, e.g.
10
:
1
5 Numerical aperture
Physical identification of the
object ive's
resolving
power
6
Immersio
n medium
Immersion media can
be,
for example.
oil
.
water
(W)
or
glycer
ine
(GLYC). The objective
must always be
used
with
the
engraved
immersion medium.
Befo re
the immersion
objective
is
focu
sed,
a
drop
of
immer
sion
medium should be
ap
plied to the object without
air
bubbles.
7
Phase
cootrast
objectives
Objectives with
phase
ring for
phase contrast
observa
tion.
These
objectives have
green
writing (with the exception of
achromats with black
sleeves).
The
labe
l for the
condenser
side
annular
stops
necessary
for
these
objectives
(e.g.
PHACO
3) in a slide or
in
the turret platc of tbe UKL phase
contrast condenser
(e.g.
PHACO
3
=
set
turret
plate
to
3)
is
also
to
be
found
on
the
phase
contrast
objec
tives.
8 Col oured ring indicating the objective magnification
9
Immersi
on
objectives
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