Canon Speedlite 90EX - Manual (Page 34)

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Flash Shooting Range Guidelines [Approx. m / ft.]
ISO speed
EF-M18-55mm f/3.5-5.6 IS STM EF-M22mm f/2 STM
18mm (f/3.5) 55mm (f/5.6) 22mm (f/2.0)
100 1 - 2.6 / 3.3 - 8.5 1 - 1.6 / 3.3 - 5.2 1 - 4.5 / 3.3 - 14.8
200 1 - 3.6 / 3.3 - 11.8 1 - 2.3 / 3.3 - 7.5 1 - 6.4 / 3.3 - 21.0
400 1 - 5.1 / 3.3 - 16.7 1 - 3.2 / 3.3 - 10.5 1 - 9.0 / 3.3 - 29.5
800 1 - 7.3 / 3.3 - 23.9 1 - 4.5 / 3.3 - 14.8 1.1 - 12.7 / 3.6 - 41.7
1600 1 - 10.3 / 3.3 - 33.8 1 - 6.4 / 3.3 - 21.0 1.6 - 18.0 / 5.2 - 59.0
3200 1.3 - 14.5 / 4.3 - 47.6 1 - 9.1 / 3.3 - 29.8 2.3 - 25.5 / 7.5 - 83.6
6400 1.8 - 20.6 / 5.9 - 67.6 1.1 - 12.9 / 3.6 - 42.3 3.2 - 36.0 / 10.5 - 118
12800 2.6 - 29.1 / 8.5 - 95.4 1.6 - 18.2 / 5.2 - 59.7 4.5 - 50.9 / 14.8 - 167
COP
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