99
8. Operation
• For
immersion objectives
use the appropriate
immersion medium.
OIL:
only use optical immersion oil
according to DIN/ISO standards.
Cleaning
→
p. 109.
W:
Water immersion.
IMM: Universal objective for water, glycerol,
oil immersion.
Caution!
Follow safety instructions for immersion oil!
Color coding of objectives
The magnifi cation of each objective is indicated by a color ring in accordance with DIN/ISO stand-
ards:
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
100x 63x 40x 25x 16x 10x 6.3x 4x 2.5x 1.6x
125x
50x
32x
20x
5x
150x
160x
white
dark-
light- dark- light- yellow orange red brown gray
blue
blue green green