Canon Speedlite 270EX - Manual (Page 21)

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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 1-6.5 / 3.3-21.3 1-4 / 3.3-13.1 - 1-5 / 3.3-16.4
200 1-9 / 3.3-29.5 1-5.5 / 3.3-18 - 1-7 / 3.3-23
400 1-13 / 3.3-42.7 1-8 / 3.3-26.2 - 1-9.5 / 3.3-31.2
800 1-18 / 3.3-59.1 1-11 / 3.3-36.1 - 1-14 / 3.3-45.9
1600 1.5-25 / 4.9-82 1-16 / 3.3-52.5 - 1-19 / 3.3-62.3
3200 1.5-35 / 4.9-114.8 1-22 / 3.3-72.2 - 1-27 / 3.3-88.6
6400 2-50 / 6.6-164 1-31 / 3.3-101.7 - 1.5-39 / 4.9-128
COP
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