Pentax ist *ist Manual - Page 115

For maximum distance, For minimum distance

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BASIC OPERATION (PREPARATION) 113 Example: If an ISO100 film is used at an aperture of f/3.5, the flash effective distance is obtained as follows: For maximum distance Guide Number (11) ÷ f/3.5 = 3.14m For minimum distance 3.14 ÷ 5 = 0.63m ¡0.7m * * Minimum distance of the built-in flash Thus, the flash effective distance is from approx. 0.7m to 3.14m. 2. Calculating the aperture according to the camera-to-subject distance Aperture = Guide Number ÷ Camera-to-subject distance Example: If the camera-to-subject distance is 2.5m and ISO 100 film is used, the effective aperture is obtained as follows: Guide Number (11) ÷ Distance (2.5m) = f/4.4 If the calculated aperture value is different from an indicated f stop, for instance f/4.4, select the next smaller aperture value. (Set at f/4 in this case.) BASIC OPERATION (SHOOTING) ADVANCED OPERATIONS OTHERS

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Example:
If an ISO100 film is used at an aperture of f/3.5, the flash
effective distance is obtained as follows:
For maximum distance
Guide Number (11)
÷
f/3.5 = 3.14m
For minimum distance
3.14
÷
5 = 0.63m
→
0.7m *
* Minimum distance of the built-in flash
Thus, the flash effective distance is from approx. 0.7m to 3.14m.
2. Calculating the aperture according to the camera-to-subject
distance
Aperture = Guide Number
÷
Camera-to-subject distance
Example:
If the camera-to-subject distance is 2.5m and ISO 100 film is
used, the effective aperture is obtained as follows:
Guide Number (11)
÷
Distance (2.5m) = f/4.4
If the calculated aperture value is different from an indicated f
stop, for instance f/4.4, select the next smaller aperture value.
(Set at f/4 in this case.)
113
BASIC OPERATION
(PREPARATION)
BASIC OPERATION
(SHOOTING)
ADVANCED OPERATIONS
OTHERS