
Flash shooting in the 1/300 TTL
•The farthest flash shooting distance cannot be read on the
D (farthest flash shooting distance)
= Guide number ÷ f/stop (aperture)
Guide number (m/ft.) in the 1/300 TTL
ISO |
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sensitivity | ∗ 1 | ∗ 2 | 14∗ 3 | 17∗ 3 | 24 | 28 | 35 | 50 | 70 | 85 | 105 |
25 | 2.5/8 | 3/10 | 3.5/11 | 3.5/11 | 5.5/18 | 6/20 | 7/23 | 8/26 | 9/30 | 9.5/31 | 10/33 |
50 | 3.6/12 | 4.3/14 | 5/16 | 5/16 | 7.8/26 | 8.5/28 | 9.9/32 | 11.4/37 | 12.8/42 | 13.5/44 | 14.2/47 |
100 | 5/16 | 6/20 | 7/23 | 7/23 | 11/36 | 12/39 | 14/46 | 16/52 | 18/59 | 19/62 | 20/66 |
200 | 7/23 | 8.4/28 | 9.8/32 | 9.8/32 | 15.4/51 | 16.8/55 | 19.6/64 | 22.4/73 | 25.2/83 | 26.6/87 | 28/92 |
400 | 10/33 | 12/39 | 14/46 | 14/46 | 22/72 | 24/79 | 28/92 | 32/105 | 36/118 | 38/125 | 40/131 |
800 | 14/46 | 16.8/55 | 19.6/64 | 19.6/64 | 30.8/101 | 33.6/110 | 39.2/129 | 44.8/147 | 50.4/165 | 53.2/174 | 56/184 |
∗1 With the Nikon Diffusion Dome attached and the
∗2 With the Nikon Diffusion Dome attached
∗3 With the
•For example, when shooting with an ISO sensitivity of 100, at a 35mm
D = 14 ÷ 5.6 (f/stop) = 2.5 (in meters) (farthest flash shooting distance)
D = 46 ÷ 5.6 (f/stop) = 8.2 (in feet) (farthest flash shooting distance)