Canon Speedlite 270EX II - Manual (Page 28)

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As the periphery of the pictures becomes dark, do not use these focal lengths.
Flash Shooting Range Guidelines (EF-S 18-55mm f/3.5 - 5.6 IS) [Approx. m / ft.]
ISO
Flash head normal position Flash head pulled forward
18mm 55mm 18mm 55mm
100 1-6.3 / 3.3-20.6 1-3.9 / 3.3-12.9 - 1-4.8 / 3.3-15.9
200 1-8.9 / 3.3-29.1 1-5.5 / 3.3-18.2 - 1-6.8 / 3.3-22.5
400 1-12.6 / 3.3-41.1 1-7.9 / 3.3-25.7 - 1-9.6 / 3.3-31.8
800 1-17.7 / 3.3-58.0 1-11.1 / 3.3-36.3 - 1-13.6 / 3.3-45.0
1600 1.5-25.1 / 4.9-82.6 1-15.7 / 3.3-51.6 - 1-19.3 / 3.3-63.6
3200 1.5-35.4 / 4.9-116.2 1-22.1 / 3.3-72.7 - 1-27.3 / 3.3-89.8
6400 2-50.3 / 6.6-164.9 1-31.3 / 3.3-103.0 - 1.5-38.6 / 4.9-127.0
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