Films should not be kept longer than six months in their original air-tight tins (tropical packing) at continual temperatures of 90
degrees F (32 degrees C). At continual 100 degrees F (38 degrees 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.
FLASH WITH THE HASSELBLAD
Flash is an efficient light source where no or insufficient daylight is available such as at night, indoors, etc. In the flashlight you carry
your own private "sun" with which you can illuminate your subject or scene at any time and place.
THE FLASH BULB is similar to a small electric bulb, However, when current passes through it, it lights up in an intense flash lasting
usually about¼0 to 1/60 sec. Each bulb will flash only once and has to be discarded afterwards.
The flash bulb is inserted in a flash gun and the current of the battery fires the bulb, while a reflector fixed behind the bulb makes sure
that all the light is directed towards the subject. Most flash guns incorporate a capacitor unit which increases the reliability of firing,
even when the battery is nearly exhausted. The shutter speed, provided it is slower than 1/30 sec. (1/60 sec. with small bulbs), has
no effect on exposure since the flash is shorter than the exposure time.
Most flash bulbs are available with a clear glass bulb (for black-and-white and negative colour film and for type F reversal colour film)
or with a blue-tinted bulb (for daylight type reversal colour films). The blue bulbs can also be used for fill-in lighting by daylight with
any type of colour film.
ELECTRONIC FLASH UNITS utilize the discharge of a high-tension capacitor through a flash tube. The power is derived from an
accumulator or battery (there are also models working from the mains electricity supply). The electronic flash outfit is rather bigger
and heavier than the flash bulb outfit, its comparative light output equals a small flash bulb and its initial cost is higher. On the other
hand, anything from 10,000 to 25,000 flashes are obtained from one tube. The flash duration is extremely short (1/700 to½000 sec.)
and will arrest the fastest movements. The cost of an individual exposure is negligible.
Electronic flash is suitable for black-and-white and negative colour film and also for daylight type, reversal colour films. It can also be
used for fill-in lighting by daylight.
The Hasselblad cameras are synchronized for use with flash bulbs and electronic flash. The handling of the camera models using lenses
with Compur shutter (500C, Super Wide and Super Wide C) and those with focal plane shutter (1600F, 1000F) is different and
therefore described separately.
Flash with Compur Shutter Models
The cable from the Flash gun is plugged into the flash socket on the shutter. On releasing the shutter, the electric firing circuit
automatically closes through the flash socket, setting off the flash at this moment.
A synchronizing lever protrudes at the ide of the shutter. This can be set to X or M.
WITH THE SYNCHRONIZING LEVER SET TO X the shutter closes the flash circuit at the moment when the blades are fully open.
Therefore, electronic flash is synchronized at any shutter speed to 1/500 sec. This setting may also be used for flash bulbs of a short
firing delay (i.e. bulbs which require only 4-6 milliseconds or½50 to 1/160 sec. to reach the peak of their light output) with the shutter
set to 1/60 sec. With older bulbs, the fastest usable speed is 1/30 sec.
WITH THE SYNCHRONIZING LEVER SET TO M the shutter closes the flash circuit 16-18 milliseconds before the shutter blades open to
allow for the firing delay of most average flash bulbs. This setting is suitable for normal flash bulbs at all speeds up to 1/500 sec. The
M-setting will not synchronize electronic flash or short-delay bulbs.
WITH THE SYNCHRONIZING LEVER SET TO V the delayed-action release for self-portraits comes into action. At the same time the
shutter works with X-synchonization. This means that you can work with delayed action and X-synchronized flash; delayed action is not
possible with M-synchronization.
Flash with Focal Plane Shutter Models
With these models the shutter is synchronized for the different types of flash with the aid of a synchronizing lever above the accessory
shoe (*). The latter carries a flash socket, but a special attachment is required to fit into the shoe for taking the flash cable connection.
Two types of this connector attachment are available, with standard European 3-mm. co-axial and American two-pin sockets
respectively. The connector carries two sockets for flash bulbs and electronic flash respectively.
Exposure Guide Numbers
The most convenient way of working out exposures with flash is by means of a guide number. When you buy flash bulbs You will
always find the guide number for any speed of film printed on the packet. With electronic flash, the guide number is given in the
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Summary of Contents for 1000 F
Page 18: ...WILD LIFE www mr alvandi com ...
Page 52: ...THE CUT FILM ADAPTOR www mr alvandi com ...
Page 54: ...Daylight Exposure Values www mr alvandi com ...
Page 55: ...Filters for Black and White Film www mr alvandi com ...
Page 59: ...Close Ranges with 50 60 mm Distagon and Planar 80 mm www mr alvandi com ...
Page 60: ...Close Ranges with 120mm S PLANAR 150 200 mm SONNAR www mr alvandi com ...
Page 62: ...Conversion of Film Speed Systems Colour Films www mr alvandi com ...
Page 63: ...Black and White Films www mr alvandi com ...
Page 64: ...www mr alvandi com ...