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AUTOMATIC
FLASH
CONTROL
In automatic
"computer"
mode the light sensing cell 3 receives
light reflected
from
the central area of the subject and cuts off the flash when enough light has been re-
ceived.
It is necessary
to set your camera lens aperture to match the one indicated on aper-
ture scale 9.
You have a choice of up to five different
apertures
with the P536 TCLS.
Both main and subflash
light is regulated
simultaneously.
Select your filmspeed
in
ASA scale 10, switch 14 to stand by selector
15 to position
A
and switch 16 to AI,
A2, A3, A4 or AS. You will see a green
lighted
figure
on the exposure
scale
9.
For ASA 100 these figures will be 2.8, 4, 5.6 8 and 11 respectively.
Position A 1 has a range of 1.5 to 13 m. (5 to 43 feet)
Position A2 has a range of 1.0 to 9.0 m. (3.3 to 30 leet)
Position
A3 has a range of 0.7 to 6.5 m. (2.3 to 21.5 feet)
Posn'oo A4 has a range of 0.7 to 4.5 m. (2.3 to 15 feet)
Position
AS has a range of 0.7 to 3.3 m. (2.3 to 10 feet)
When the subject is closer than 1.5 m (5 feet) it is advisable
to select the wide angle
refractor
and
W
settings
when using normal lenses.
Depending
on the actual flash-to-object
distance,
a choice can be made between
these computer
ranges. In general,
the computer
setting with the shorter distance
range (smallest aperture)
should be selected to ensure the greatest depth of focus.
Set the correct film speed with the ASA sliding control 11 and select AI, A2, A3, A4
or AS. You will find the maximum
distance
for this computer
range above the lit ex-
posure
indication.
For ASA 80, you will find a green indication
between
two exposure
values. This is
between 4 and 5.6 for position A3. You should then set the aperture of your camera
between
4 and 5.6. If this is not possible,
aperture
4 should be selected.
Example:
you are using a 100 ASA film and set the slider 11 accordingly.
If you se-
lect a computer
range of between
0.7 m and 6.5 m (2.3 to 21.5 feet) (position A3).
you should select aperture
5.6 on your camera.
Note:
If you have a "Flashmatic"
camera (with a built-in flash control) you cannot
use automatic
control but have to follow the instructions
for MANUAL
CON-
TROl.
AUTOMATIC
FLASH
RANGE
CHECK
In order to be certain that the flash unit provides sufficient
light to illuminate
the sub-
ject correctly,
you can make a triaillash.
This is done as follows:
set the selector
15 to position
A.
Then select A I, A2, A3, A4 or AS. Wait until the indicator
lamps 20, 21 and 22 light
up and then press test button
18. If indicator
lamp 19 lights up, there is sufficient
light for a good picture. You can also check this after an exposure.
If indicator
19
does not glow, try position A I, or the one permitting
largest camera
lens aperture.
MANUAL
FLASH
CONTROL
In contrast with an automatic
flash control, the flash unit gives the same quantity
of
light under all circumstances
in the M position.
Set switch 14 to the standby
positi-
on, press this switch and then set switch 15 to position
M. Set switch 16 to position
1. Determine
the distance
to the subject and select the aperture setting on your ca-
mera corresponding
to the distance and the film speed (ASA) as shown on aperture
scale
9.
Example:
At a film speed of 100 ASA and a distance
from the object to be photo-
graphed
of 9 metres, the aperture
of your camera should be set at f4.
A simple iormula is:
guide number
distance
in metres
=
aperture (1 metre is approx. 1 yard)
Your flash unit has a guide number
of 36. It makes negligable
difference
whether
the subflash
is on or off.
Please remember
that this is only the case when switch 16 is in position
1.
The 1/2, 1/4, 1/16 and 1/64 positions
of switch 16 ensure that the flash unit produ-
ces a reduced
but fixed quantity of light (power ratio). As compared
with position
1
and at the same distance, you must open the aperture
by one, two, four or six stops
further respectively.
This facility for selecting
light quantities
not only saves energy but also makes the
flash unit suitable
for less usual flash exposures,
e.g. for macrophotography
or
when using a camera fitted with a winder or motor drive or in circumstances
where
less light is desirable.
Example:
You are using a 1.00 ASA film and set the flash unit accordingly.
Set
switch 15 to position M. The distance to the subject
IS
4.5 metres. When switch 16 is
in position
I, aperture
f8 should be selected.
However,
if you select position
1/2,
you
should
also select aperture
f5.6. If you select position
1/16, you should use
aperture
f2, given the same distance.
SHOOTING
Focus your camera and take the picture if the indicator
lamps 20, 21 and 22 are lit.
FOR YOUR INFORMATION:
25 ASA = 15 DIN
50 ASA=
18 DIN
64 ASA = 19 DIN
80 ASA = 20 DIN
100 ASA = 21 DIN
125ASA=22DIN
200 ASA = 24 DIN
400 ASA = 27 DIN
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