Pentax AF160FC User Manual
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Subject distance guideline
How to use the flash guidelines
You can determine the distance from the ISO sensitivity, the flash mode dial setting (FULL, 1/4, 1/16), and the aperture settings.
Example: If the ISO sensitivity = 200, the mode dial setting = 1/4, and the aperture = F11, then the distance is about 1.0 m. (Exposure = 1x)
You can also determine a combination of aperture, mode dial setting, and ISO sensitivity by figuring backwards from the distance.
* The values in the guideline are for 1x exposure. The exposure for taking photos varies depending on the subject and shooting conditions. We recommend taking test
shots to check the exposure for the shot. (Try opening the aperture and increasing the exposure.)
Manual flash guidelines and calculation methods
Unit: m
ISO
mode
GN
F2.8
F4
F5.6
F8
F11
F16
F22
F32
F45
100
FULL
16.0
5.7
4.0
2.8
2.0
1.4
1.0
0.71
0.50
0.35
1/4
8.0
2.8
2.0
1.4
1.0
0.71
0.50
0.35
0.25
0.18
1/16
4.0
1.4
1.0
0.71
0.50
0.35
0.25
0.18
0.13
0.09
200
FULL
22.6
8.0
5.7
4.0
2.8
2.0
1.4
1.0
0.71
0.50
1/4
11.3
4.0
2.8
2.0
1.4
1.0
0.71
0.50
0.35
0.25
1/16
5.7
2.0
1.4
1.0
0.71
0.50
0.35
0.25
0.18
0.13
400
FULL
32.0
11
8.0
5.7
4.0
2.8
2.0
1.4
1.0
0.71
1/4
16.0
5.7
4.0
2.8
2.0
1.4
1.0
0.71
0.50
0.35
1/16
8.0
2.8
2.0
1.4
1.0
0.71
0.50
0.35
0.25
0.18
800
FULL
45.3
16
11
8.0
5.7
4.0
2.8
2.0
1.4
1.0
1/4
22.6
8.0
5.7
4.0
2.8
2.0
1.4
1.0
0.71
0.50
1/16
11.3
4.0
2.8
2.0
1.4
1.0
0.71
0.50
0.35
0.25
1600
FULL
64.0
23
16
11
8.0
5.7
4.0
2.8
2.0
1.4
1/4
32.0
11
8.0
5.7
4.0
2.8
2.0
1.4
1.0
0.71
1/16
16.0
5.7
4.0
2.8
2.0
1.4
1.0
0.71
0.50
0.35
3200
FULL
90.5
32
23
16
11
8.0
5.7
4.0
2.8
2.0
1/4
45.3
16
11
8.0
5.7
4.0
2.8
2.0
1.4
1.0
1/16
22.6
8.0
5.7
4.0
2.8
2.0
1.4
1.0
0.71
0.50
6400
FULL
128.0
45
32
23
16
11
8.0
5.7
4.0
2.8
1/4
64.0
23
16
11
8.0
5.7
4.0
2.8
2.0
1.4
1/16
32.0
11
8.0
5.7
4.0
2.8
2.0
1.4
1.0
0.71
4
AF160FC.book Page 33 Monday, November 17, 2008 10:43 AM