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Leica DM 500, DM500 B Manual 38
General maintenance (cont.)
Ϙ No part of the microscope is quite so vulner-
able to collecting dirt, dust, and oil as the
front lens of the objective. Whenever you
encounter lack of contrast, cloudiness or
poor definition, carefully check the condi-
tion of the front lens with a magnifier.
Ϙ The lower magnification objectives have
fairly large front lenses and can be cleaned
with a cloth or lens tissue wrapped around
a finger and moistened with methanol.
Ϙ Cleaning 40× and 100× objectives requires
more care. Note: To achieve the high degree
of flatness obtained with higher magnifica-
tion objectives, the objective has a small
concave front lens of fairly short radius or
curvature. The surface of this front lens can
be readily cleaned with a toothpick covered
with a cotton tip, or with a small cotton
swab. Moisten the cotton with methanol
and squeeze it almost dry (do not use alco-
hol). Wipe the front lens lightly without
applying undue force or scrubbing action.
Make sure that the cotton tip contacts the
concave lens surface. Check the objective
with a magnifier after cleaning.
Ϙ If you need to remove the microscope’s
viewing body, be careful not to accidentally
touch the outer lens surface (located on
the underside of the body). Fingerprints on
this surface will reduce image clarity. This
lens can be cleaned in the same manner as
objectives and eyepieces.
Illumination
Ϙ The Leica DM500 and DM500 B uses LED
illumination. Therefore, no lamp changing
is required for the life of the microscope.