Leica SUMMARON-M 1:5,6/28mm, Instructions Manual

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EN
18
TIPS ON LENS CARE
Dust on the outside of the lens should be removed carefully with a soft-haired
brush or a soft, clean, dry cloth. We recommend micro-fiber cloths (available
from photographic and optical specialists) that are stored in a protective
container and can be washed at temperatures of up to 40°C (without fabric
softener, never iron!). If stains and fingerprints have to be removed, use such a
cloth and clean with a circular movement starting at the center of the lens. Do
not use the type of cloths used especially for cleaning eyeglasses since these
are impregnated with chemicals which can damage the glass used for high
performance lenses.
In order to ensure fast and smooth lens changes, the bayonet has been coated
with a thin layer of grease in the factory. Normally, this lubricating film will
remain on the lens for years, even if the lens is wiped from time to time. In the
event that a grease solvent is used when cleaning, a fresh layer of grease
should be applied. To do this, apply a small amount of vaseline to the bayonet
with your finger and spread it with a clean cloth.
Important: Make sure not to apply too much vaseline to the bayonet, especially
to omit the lens identification bar code (6), because residual grease could
otherwise remain in the recess and lead to further grime accumulating. This
could even cause the code to become illegible and thus interfere with some
camera functions in digital M-models. In addition to the designation by type,
each lens has an individual serial number. Please note this number in your
documents as a safety measure.