Manual Flash Guidelines And Calculation Methods - Pentax AF160FC Operating Manual

AF160FC.book Page 33 Monday, November 17, 2008 10:43 AM

Manual flash guidelines and calculation methods

Subject distance guideline
Unit: m
ISO mode GN
FULL 16.0
100 1/4 8.0
1/16 4.0
FULL 22.6
200 1/4 11.3
1/16 5.7
FULL 32.0
400 1/4 16.0
1/16 8.0
FULL 45.3
800 1/4 22.6
1/16 11.3
FULL 64.0
1600 1/4 32.0
1/16 16.0
FULL 90.5
3200 1/4 45.3
1/16 22.6
FULL 128.0
6400 1/4 64.0
1/16 32.0
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.)
F2.8 F4 F5.6
5.7 4.0 2.8
2.8 2.0 1.4
1.4 1.0 0.71
8.0 5.7 4.0
4.0 2.8 2.0
2.0 1.4 1.0
11 8.0 5.7
5.7 4.0 2.8
2.8 2.0 1.4
16 11 8.0
8.0 5.7 4.0
4.0 2.8 2.0
23 16 11
11 8.0 5.7
5.7 4.0 2.8
32 23 16
16 11 8.0
8.0 5.7 4.0
45 32 23
23 16 11
11 8.0 5.7
F8 F11 F16
2.0 1.4 1.0
1.0 0.71 0.50
0.50 0.35 0.25
2.8 2.0 1.4
1.4 1.0 0.71
0.71 0.50 0.35
4.0 2.8 2.0
2.0 1.4 1.0
1.0 0.71 0.50
5.7 4.0 2.8
2.8 2.0 1.4
1.4 1.0 0.71
8.0 5.7 4.0
4.0 2.8 2.0
2.0 1.4 1.0
11 8.0 5.7
5.7 4.0 2.8
2.8 2.0 1.4
16 11 8.0
8.0 5.7 4.0
4.0 2.8 2.0
F22 F32 F45
0.71 0.50 0.35
0.35 0.25 0.18
0.18 0.13 0.09
1.0 0.71 0.50
0.50 0.35 0.25
0.25 0.18 0.13
1.4 1.0 0.71
0.71 0.50 0.35
0.35 0.25 0.18
2.0 1.4 1.0
1.0 0.71 0.50
0.50 0.35 0.25
2.8 2.0 1.4
1.4 1.0 0.71
0.71 0.50 0.35
4.0 2.8 2.0
2.0 1.4 1.0
1.0 0.71 0.50
5.7 4.0 2.8
2.8 2.0 1.4
1.4 1.0 0.71
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