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Leica DM750 Manual 47
Ϙ No part of the microscope is quite so vulne-
rable 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 attain the typical flat-
ness for objectives with higher magnifica-
tion, the objective has a small concave front
lens with a very small radius and slight
curvature. The surface of this front lens can
be readily cleaned with a toothpick cove-
red with a cotton tip, or with a small cotton
swab. Soak the cotton with isopropanol
and squeeze it out until it is almost dry
again. 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.
Mechanical Maintenance
Ϙ Use the dust cover. It is the most impor-
tant way to keep the microscope in good
mechanical and physical condition.
Ϙ The Leica DM750 has a durable finish. All
non-optical parts of the instrument can
be cleaned with isopropanol or soap and
water. Avoid the use of all other organic
solvents when cleaning the instrument.
Illumination
Ϙ The Leica DM750 uses LED illumination.
Therefore, no lamp changing is required for
the life of the microscope.
General maintenance (cont.)