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OPTICAL EQUIPMENT
The Karat 36 is equipped with the Agfa Anastigmat Solinar
f
/
2.8
lens, having a
focal length of 2 inches (50 mm
.).
The lenses are coated to reduce reflections at the
glass surfaces to a minimum. The advantages of this treatment are a certain gain in
the eftective speed of the
lens,
increased brilliance, and last not least, almost complete
elimination of troubles caused by reflection from the lens surfaces (flare
spots,
scat-
tered I ig ht, etc.).
To clean the outer lens surfaces use only a soft chamois leather or a well-washed linen
rag
.
Either must be absolutely free from
grease,
soap residues, and
dust.
Breathing
on the glass to facilitate cleaning will not cause any appreciable harm
.
Never unscrew
the lens elements
;
if the interior should ever need cleaning
,
get an expert to do it so
as not to upset the fine correction of these high-aperture lenses
.
Remember that a lens that has steamed up owing to a sudden change of temperature
will only clear when the whole camera body has reached the new room temperature.
31
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