Canon EOS 70D Instruction Manual page 118

D Using the Built-in Flash
Effective Range of Built-in Flash
ISO Speed
100
200
400
800
1600
3200
6400
12800
H (25600)
118
EF-S18-55mm f/3.5-5.6 IS STM
EF-S18-135mm f/3.5-5.6 IS STM
EF-S18-200mm f/3.5-5.6 IS
Wide Angle: f/3.5
1-3.4/3.3-11.2
1-4.8/3.3-15.9
1-6.9/3.3-22.5
1.2-9.7/4.0-31.8
1.7-13.7/5.6-45.0
2.4-19.4/8.0-63.6
3.4-27.4/11.2-90.0
4.8-38.8/15.9-127.3
6.9-54.9/22.5-180.0
[Approx. in meters/feet]
Telephoto: f/5.6
1-2.1/3.3-7.0
1-3.0/3.3-9.9
1-4.3/3.3-14.1
1-6.1/3.3-19.9
1.1-8.6/3.5-28.1
1.5-12.1/5.0-39.8
2.1-17.1/7.0-56.2
3.0-24.2/9.9-79.5
4.3-34.3/14.1-112.5