2524
When Using the "A" ( AUTO ) Lens Aperture
Programmed TTL Auto Flash is possible with the
AF360FGZ when the Programmed AE or Shutter-
Priority AE mode is set on a camera. The flash sync
speed and aperture values automatically vary
depending on the subject brightness as with the
camera's built-in flash, making it suitable for daylight
sync flash.
When Setting the Lens to a Manual f/stop
When the Aperture-Priority AE or Metered Manual
mode is set on the camera, TTL Auto Flash is
possible with the desired aperture selected to
control the depth-of-field. The slow-speed-sync
flash is also possible.
Calculating the Flash Effective Range
When setting the lens to manual f/stop, calculate the guide number at FULL output strength with the use
of flash's zooming position and film speed. Divide the resulting guide number by the aperture in use.Thus,
the maximum distance is obtained. The minimum distance is obtained in dividing this max. distance by
approx. 10.However, if the shortest distance desired is 0.7m or less, the shortest distance will be 0.7m.
Example :
With ISO100 film and a 50mm lens at f/4
q For the zoom position = 50mm, and film speed at ISO100, the guide number is 30.
w The aperture is f/4, 30 ( guide number )/4 ( aperture ) = 7.5m ( max. distance )
e 7.5m ( max. distance )/10 = 0.75m ( min. distance ) Thus, flash effective range is approx. 0.75m - 7.5m.
Format
ISO 100 ISO 400
Zooming position Zooming position
35mm 20mm 24mm 28mm 35mm 50mm 70mm 85mm 20mm 24mm 28mm 35mm 50mm 70mm 85mm
645 35mm 45mm 55mm 70mm 100mm 135mm 150mm 35mm 45mm 55mm 70mm 100mm 135mm 150mm
67 55mm 60mm 70mm 90mm 120mm 180mm 190mm 55mm 60mm 70mm 90mm 120mm 180mm 190mm
f / 1.2 1.2~11.7 1.8~17.5 1.8~18.3 2.1~20.8 2.5~25.0 2.8~27.5 3.0~30.0 2.3~23.3 3.5~35.0 3.7~36.7 4.2~41.7 5.0~50.0 5.5~55.0 6.0~60.0
f / 1.4 1.0~10.0 1.5~15.0 1.6~15.7 1.8~17.9 2.1~21.4 2.4~23.6 2.6~25.7 2.0~20.0 3.0~30.0 3.1~31.4 3.6~35.7 4.3~42.9 4.7~47.1 5.1~51.4
f / 2 0.7~7.0 1.1~10.5 1.1~11.0 1.3~12.5 1.5~15.0 1.7~16.5 1.8~18.0 1.4~14.0 2.1~21.0 2.2~22.0 2.5~25.0 3.0~30.0 3.3~33.0 3.6~36.0
f / 2.8 0.7~5.0 0.8~7.5 0.8~7.9 0.9~8.9 1.1~10.7 1.2~11.8 1.3~12.9 1.0~10.0 1.5~15.0 1.6~15.7 1.8~17.9 2.1~21.4 2.4~23.6 2.6~25.7
f / 4 0.7~3.5 0.7~5.3 0.7~5.5 0.7~6.3 0.8~7.5 0.8~8.3 0.9~9.0 0.7~7.0 1.1~10.5 1.1~11.0 1.3~12.5 1.5~15.0 1.7~16.5 1.8~18.0
f / 5.6 0.7~2.5 0.7~3.8 0.7~3.9 0.7~4.5 0.7~5.4 0.7~5.9 0.7~6.4 0.7~5.0 0.8~7.5 0.8~7.9 0.9~8.9 1.1~10.7 1.2~11.8 1.3~12.9
f / 8 0.7~1.8 0.7~2.6 0.7~2.8 0.7~3.1 0.7~3.8 0.7~4.1 0.7~4.5 0.7~3.5 0.7~5.3 0.7~5.5 0.7~6.3 0.8~7.5 0.3~8.3 0.9~9.0
f / 11 0.7~1.3 0.7~1.9 0.7~2.0 0.7~2.3 0.7~2.7 0.7~3.0 0.7~3.3 0.7~2.5 0.7~3.8 0.7~4.0 0.7~4.5 0.7~5.5 0.7~6.0 0.7~6.5
f / 16 0.7~0.9 0.7~1.3 0.7~1.4 0.7~1.6 0.7~1.9 0.7~2.1 0.7~2.3 0.7~1.8 0.7~2.6 0.7~2.8 0.7~3.1 0.7~3.8 0.7~4.1 0.7~4.5
f / 22 0.7~1.0 0.7~1.0 0.7~1.1 0.7~1.4 0.7~1.5 0.7~1.6 0.7~1.3 0.7~1.9 0.7~2.0 0.7~2.3 0.7~2.7 0.7~3.0 0.7~3.3
f / 32 0.7~0.8 0.7~0.9 0.7~1.0 0.7~1.1 0.7~0.9 0.7~1.3 0.7~1.4 0.7~1.6 0.7~1.9 0.7~2.1 0.7~2.3
P-TTL and TTL Auto Flash Effective Range
Unit : m
f/stop
PENTAX AF360 FGZ/1 BODY 4/15/03 11:26 AM Page 24
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