Yashica Twin Lens Reflex Guide - Focal Press January 1964
Page 42 / 55
Scans and Document copyright by Mischa Koning - www.3106.net
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So far we have assumed that the exposures have been for average shots without much subject movement. For these a
shutter speed of 1/30 sec. is long enough to utilize all the light emitted from the bulb. On the other hand, to arrest fast
movements a faster shutter speed is required, such as 1/125,1/250 or even 1/500 sec. With each of these speeds a different
guide number is needed (usually printed on the flash bulb packet) to determine the correct exposure. They allow for a
wider aperture to compensate for the fact that at fast shutter speeds some of the fight emitted from the bulb is lost.
FLASH
The X flash synchronization Setting is suitable for electronic flash
at all speeds and for ordinary (class M) flash bulbs up to1/25 sec.
(Model A) and
up to 1/30 sec.
(All other
models).
M setting is
suitable for
ordinary (class M) flash bulbs at all speeds. It is not suitable for
flash with electronic flash units.
Flashguns can be attached to the Yashica models either by means of the accessory shoe on the side of the camera or
by a bracket affixed to the tripod socket in the camera base. Either of these positions may be used, whether the
synchronization socket is at the top or bottom of the camera.
CAMERA CARE IN TROPICAL CLIMATES
High and widely varying temperatures with low humidity, as occur in desert regions and dry seasons, and very high
humidity in rainy seasons, call for special precautions to protect the life and continued good performance of the camera.
These conditions also cause the growth of moulds on organic matter, Sand, dust and insects may present problems.
The camera should be kept dry and clean. Leather parts should be wax polished, metal parts lightly greased. Never leave
the camera unnecessarily exposed to heat. Always keep it in its case. The lens should be covered with the lens cap when
not in use. Outer lens surfaces have to be kept clean, dirt and grit removed with an air-blower and by tapping. Wipe the
lens surface with cotton wool or open mesh fabric (butter muslin) when required.
Store photographic equipment in an airtight metal box or a tin which should be sealed with adhesive (e.g. medical) tape. In
a humid atmosphere, add some desiccating agent, e.g. silica gel.
Condensation on the lens may occur when the camera is moved from a cool place into humid heat; this has to be removed
before use and the whole camera carefully wiped before re-storing.
Films should not be kept longer than six months in their original airtight tins (tropical packing) at continual temperatures
of 90°F (32°C). At continual 100°F (38°C), the life of most films is limited to a month or two, Keep films for as short as
possible a time in the camera.
Films should be processed as soon as possible after exposure-within a week or two or, in very hot humid climates, within a
few days. Keep the film in an airtight container with desiccant (to absorb moisture). If possible, keep in a refrigerator, but
only if you can dry out the exposed film and the container is sealed.
