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115
Colour coding of the objectives
The magnification of each objective is indicated as per DIN/ISO standard by a colour ring:
Black Oil or IMM (= universal for oil,
water, glycerine)
White Water
Orange Glycerine
Fig. 91 Immersion objectives
1, 2 Oil immersion objectives (OIL), 1 in working position,
2 locked in shortened position, 3 Water immersion objective
(W), 4 Universal immersion objective (IMM) for water,
glycerine, oil, 5 Colour coding for immersion, 6 Knurled ring
for screwing down
The different colour of the objective engraving
indicates the use of the objective:
Black or Brightfield objectives,
dark blue low-strain
Green Phase contrast objectives,
low-strain
Locking of objectives
The front part of immersion objectives (OIL, W,
IMM) can be pushed up (91.1 and 91.2) by about
2 mm and locked in a shortened position by a
slight rotary movement. This stops any
remaining drops of immersion liquid from
wetting specimens or other objectives when the
nosepiece is turned.
Immersion objectives also have a second colour ring underneath:
1
6
5
234
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 grey
blue blue green green