6
8.
Cleaning and maintenance
The lens should always be capped when not in use. Like other precision optics, it should never
be simply wiped with a tissue since this may abrade the surface with any dust clinging to it or
on the lens.
Any accumulated dust should occasionally be blown off with a syringe or available blower
brush designed for this purpose. To remove fingerprints or smears, shred the edge of a lens
tissue and roll it to make a swab: dampen it with a lens cleaner specially made for
photographic optics and gently wipe the surface without exercising any pressure. Repeat the
procedure if necessary using a new swab. To clean, start at the center of the lens, using a
circular motion and working to the edge of the lens for best results.
When the lens is not in use, it should be stored in a cool dry place, however, if this is not
possible, a leather case with a silicate gel packet will afford the same protection as an
aluminum case with polyfoam liner.#
9.
Fault finding
Phenomena
Causes
Measures
A lens can´t be
attached to the
camera
The lens ring mount and
the camera mount are
not aligned.
Align the lens ring mount and
the camera mount.
A lens can´t be
detached from the
camera
Incorrect rotation
direction for detaching.
If the user turns the lens
while holding the
camera, it may cause
damage to the lens.
Press the lens release button on
the camera, and lightly turn the
lens to the lens attaching and
detaching reference points, in
the direction as marked on the
camera and then pull the lens
forward.
Dark Image
Incorrect focusing.
Insufficient shutter
speed or camera shake
Turn the focus ring while
checking the indication or
checking an object visually, set
the focus until it reaches a clear
point and then press the
shutter. Steady the camera and
take a photograph at a shutter
speed of 1/125 sec.
Autofocus failure
Autofocus failed with
manual control focus
lens
Set focus by turning the focus
ring.
Dark or too bright
pictures
Inappropriate exposure
Adjust the aperture size by
turning the lens or adjust the
shutter speed
