What mode are you shooting in A+, M, Av, Tv, P or any other Fully Automated modes. The flash must be popped up manually. With most current Rebel Cameras the flash icon will blink if the built in flash is needed. Or if the AF Assist Beam is needed. If AF becomes difficult under low light or contrast situations.
-Demetrius
Current Gear: EOS 5D Mark IV, EF 16-35mm F/2.8L III USM, EF 24-70mm F/2.8L II USM, EF 50 F/1.8 STM, EF 85mm F/1.8 USM, EF 70-200mm F/2.8L IS III USM, 430EX III-RT, 470EX-AI & 600EX II-RT
Retired Gear: EOS 40D, Sigma 17-50mm F/2.8 EX DC OS HSM & EF 28-135mm F/3.5-5.6 IS USM
