Leica M Operating Instructions Manual page 189

FOR LENSES
• Normally, a soft hair brush is sufficient to remove dust from the
outer lens elements. However, in case of more stubborn dirt,
they can be carefully cleaned with a very clean, soft cloth that
is completely free of foreign matter, using circular motions
from the inside to the outside. We recommend micro-fiber cloths
(available from photographic and optical specialists) that are
stored in a protective container and can be washed at tempera-
tures of up to 40°C (without fabric softener, never iron!). Cloths
for cleaning glasses, which are impregnated with chemicals,
should not be used as they can damage the lens glass.
• Take care that the 6-bit coding (see page 121) in the bayonet
fastening does not become soiled or scratched. Take care also
that no grains of sand or similar particles enter the fastening,
where they could scratch the bayonet. Never wet this compo-
nent when cleaning it!
• For optimum front lens protection in unfavorable photographic
conditions (e.g. sand, salt water spray), use transparent UVa
filters. However, you should bear in mind that, like all filters, they
can cause unwanted reflections in certain backlight situations
and with high contrasts. The generally recommended lens hood
also protects the lens from unintentional fingerprints and the
rain.
FOR THE BATTERY
Rechargeable lithium ion batteries generate power through internal
chemical reactions. These reactions are also influenced by the
ambient temperature and humidity. Very high and low tempera-
tures shorten the operating time and service life of the batteries.
• Always remove the battery, if you will not be using the camera
for a long period of time. Otherwise, after several weeks the
battery could become totally discharged, i.e. the voltage is
sharply reduced as the camera still consumes a small amount of
current (for saving your settings) even when it is turned off.
• Lithium ion batteries should only be stored in a partially charged
condition, i.e. not completely discharged or fully charged (in the
corresponding display in the monitor). If the battery is stored for
a long period of time, it should be charged around twice a year
for approximately 15 minutes to avoid a full discharge.
• Always ensure that the battery contacts are clean and freely
accessible. Whilst lithium ion batteries are proof against short
circuits, they should still be protected against contact with metal
objects such as paper clips or jewelry. A short-circuited battery
can get very hot and cause severe burns.
• If a battery is dropped, check the casing and the contacts
immediately for any damage. Using a damaged battery can
damage the camera.
EN
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