Canon 166 A User Manual
Page 43
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3. Focus the subject,
4.
Read the shooting distance from the
lens’ distance scale
5.
Calculate the aperture using the fol
lowing guide number formula:
guide number
Aperture —-------------------------------------
shooting distance
6
Set the aperture on the lens.
7
Turn the main switch ON
8
Do not press the shutter button until
the pilot lamp glows
*
The 166A’s guide number is 20 (ASA
100, m) or 33 (ASA 25, ft.)
' Make sure that both the guide number
and shooting distance are in the same
unit, whether meters or feet
•
The guide number changes with film
speed Attach the guide number table
onto the 166A for convenient use,
' If it is necessary to shoot immediately
after the pilot lamp glows, open the
25