I was shooting my company’s event in an indoor recently and my gears were Canon 400D, 17-55 F2.8 and a Canon Speedlite 580EXII flash.
Initially when I want to shoot an individual, I set my camera to Manual (M) mode, Aperture to F2.8 and shuttle speed 1/60 with attached the flash set to E-TTL and let the E-TTL to handle everything. The result and exposure look fine for this setting.
However, when I want to shoot covering more people and increase my Aperture above F5.6, the result has turned to ‘Under exposured’.
1. I thought the E-TLL on my flash will handle everything to evaluate the correct exposures when every time I switching my Aperture? (correct me if I wrong)
2. In such situation, shall I adjust the FEC (Flash exposure compensation) or the camera’s EC (exposure compensation) or any alternative?
I would appreciate the Masters/sifu here can give me some advice.