Canon 166 A User Manual
Flash Head ASA Film Speed Window
Aperture/MANU Window ^ aSA Film Speed
Switch
/
Main Switch
Sensor /i
Lock Nul /
Directly Coupled Contact
Pilot Lamp (Flash Test Button)
Aperture/MANU Selection Switch
Auto Shooting
Distance Range
Indicator
Load the batteries correctly Mount the 166A on the camera
<
Summary for Use of the 166A
Set the 166A’s main switch to ON
Wait for the pilot lamp to glow
Set the ASA film speed
Check viewfinder information, and
press the shutter button.
r 75ir
. 125
1 30
1
_ _ _ _ _
Ll
_____
>
Focus on the subject and select an
aperture.
Loading the Batteries
Use four new size AA alkaline-man
ganese (LR6/AM-3) or Ni-Cd batteries.
Carbon-zinc batteries may also be
used, but their battery life is shorter.
Before loading the batteries, wipe their
contacts and the flash contacts with a
clean, dry cloth to prevent dirt from
causing poor contact.
Press anrJ slide the battery chamber
cover oft in the direction of the arrow
in the photo.
Load the batteries so that their con
tacts are in the directions indicated by
the diagram inside the battery cham
ber For proper function of the flash, it
is very important that their contacts be
facing in the correct directions.
Once the batteries are loaded, slide
the battery chamber cover back on
while pressing the batteries down
Make sure the cover's tab fits into the
corresponding groove on the flash
body.
Remove the batteries if you do not ex
pect to use the 166A for about three
weeks or longer
Set the main switch to OFF when flash
photography is finished
When the batteries become exhausted,
replace all four at the same time with
four new ones of the same brand
Since battery performance deteriorates
in low temperatures, keep the batteries
warm until just before use. Keep a set
of spare batteries warm and alternate
them with the loaded ones so'that
warm batteries are always in use.
In temperatures below 0°C (32'F), the
use of fully-charged Ni-Cd batteries is
recommended.
Each brand of Ni-Cd batteries has its
own terminals system Be sure to use a
type which is suitable for this flash
When recharging Ni-Cd batteries, fol
low the instructions of the battery man
ufacturer
Mounting the 166A on the
Camera
1. Turn OFF the 166A's main switch
2 Loosen the lock nut and insert the
Speedlite into the camera's accessory
shoe For correct electrical contact,
make sure it is pushed in all the way.
3. Retighten the lock nut
Setting the ASA Film Speed
To set the film speed, slide the ASA film
speed switch until the ASA value of your
film is aligned with the orange index. At
this time, the aperture displayed in the Aperture/MANU window will also change
Because the guide number of the flash
varies with the sensitivity of the film in use,
be sure to set the ASA film speed correctly
* Make sure that the camera is set to the
correct ASA film speed.
It is possible to set the following ASA
film speeds Numbers in parentheses
are intermediate film speeds indicated
by the dots on the scale.
(32) (40) (64) (80) (125) (160)
ASA25 • *50 • • 100 •
(250) (320) (500)
200
• 400 •
(640)
800
Choosing an Aperture and
Reading its Value
There is a choice of two apertures for au
tomatic flash photography To select an
aperture, set the Aperture/MANU selection
switch to the upper or middle position; the
aperture value will appear in the Aper
ture/MANU window. The aperture wilt
change depending on the setting of the
ASA film speed When ASA 100 film is
used, for instance, the upper position is
f/2.0 and the middle position is f/5 6.
When the Aperture/MANU selection switch
is set on the lowest position, "MANU" ap
pears in the window. As this indicates
manual flash photography, automatic flash
photography is impossible on this setting
* In automatic flash photography, if the
ASA film speed is set between gradua
tions, such as 64 or 00, the aperture
value indicated is between click-stops
on the aperture ring. In the case of the
AL-1, AV-1, AT-1 or New F-1, set the
lens' aperture ring to the click-stop of
the larger aperture.
10
Reading the Auto Shooting
Distance Range
Once you have selected an aperture by
setting the Aperture/MANU selection
switch to the upper or middle position,
there is only a certain range of shooting
distances which will give correct exposure.
On the 166A, the correct shooting distance
is indicated by the red and green lines in
accordance with the selection of the aperture.
Effective Shooting Distance
Green Line
0 5-3 5m; 1 6-11 ft.
After focusing, confirm the shooting dis
tance on the lens' distance scale Remem
ber that correct exposure is impossible if
the shooting distance is not within the ef
fective shooting range
Both depth of field and the shooting dis
tance are factors to consider when select
ing an aperture on the 166A When the
subject distance is between 1 ~3 5m
(3 3~11ft.), use the following as guides:
Upper position: For isolating the subject
(red line) from its surroundings by
blurring the foreground
and background
1-7m; 3 3-22 ft
'
Red Line
Middle position: For the widest range of
(green line) good focus in front of and
* Note that the auto shooting distance
ranges remain the same regardless of
the film speed
behind the subject.
Loading...