8. Operation
• For immersion objectives use the appropriate
immersion medium.
OIL:
only use optical immersion oil
according to DIN/ISO standards.
Cleaning → p. 110.
W:
Water immersion.
IMM: Universal objective for water, glycerol,
oil immersion.
Color coding of objectives
The magnifi cation of each objective is indicated by a color ring in accordance with DIN/ISO stand-
ards:
100x
63x
125x
150x
160x
white
dark-
blue
Immersion objectives are marked by an addition-
al, lower color ring.
black
oil or Imm (universal objective for
oil, water or glycerin)
white
water
orange
glycerin
The various engraved markings of the objectives
provide information on their applications:
black or
bright fi eld objectives,
dark blue
strain-free
green
phase contrast objectives,
strain-free
100
40x
25x
16x
50x
32x
20x
light-
dark-
light-
blue
green
green
Caution!
Follow safety instructions for immersion oil!
10x
6.3x
yellow
orange
4x
2.5x
1.6x
5x
red
brown
gray