Canon Speedlite 270EX Instruction Manual page 21

Flash Shooting Range Guidelines (EF-S 18-55mm f/3.5 - 5.6 IS)
Flash head normal position
ISO
18mm
100 1-6.5 / 3.3-21.3
200 1-9 / 3.3-29.5
400 1-13 / 3.3-42.7
800 1-18 / 3.3-59.1
1600 1.5-25 / 4.9-82
3200 1.5-35 / 4.9-114.8
6400 2-50 / 6.6-164
As the periphery of the pictures becomes dark, do not use these focal lengths.
55mm
1-4 / 3.3-13.1
1-5.5 / 3.3-18
1-8 / 3.3-26.2
1-11 / 3.3-36.1
1-16 / 3.3-52.5
1-22 / 3.3-72.2
1-31 / 3.3-101.7
[Approx. m / ft.]
Flash head pulled forward
18mm
- 1-5 / 3.3-16.4
- 1-7 / 3.3-23
- 1-9.5 / 3.3-31.2
- 1-14 / 3.3-45.9
- 1-19 / 3.3-62.3
- 1-27 / 3.3-88.6
- 1.5-39 / 4.9-128
55mm
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