One of the greatest advantages of Live View shooting with Canon EOS DSLRs is the ability to see, on the rear LCD screen, a live histogram and an approximation of exactly what the final image will look like. When looking at the Live View image on the rear LCD screen, you may see ‘Exp.SIM’ (which stands for Exposure Simulation) shown in the bottom right hand corner of the screen. If this is shown in white, it indicates that the image you are seeing on the rear screen is close to what the final image will look like. If the ‘Exp.SIM’ is flashing it is probably because you are shooting in very bright or dark conditions, thus indicating that the image shown on screen will differ from that captured. If this is the case, you should judge your exposure from the histogram and exposure scale, rather than from looking at the LCD screen.
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