Here is how to change the flash sync speed in Av mode:
Use direct flash on camera Aperature Priority (Av) setting at 1/200 sec shutter speed
Use direct flash off camera Aperature Priority (Av) setting at 1/200 sec shutter speed
Use flash fill Aperture Priority Auto shutter speed
Use flash with modifier (Bounce card, bank or ceiling) Aperature Priority (Av) setting at 1/200 sec shutter speed. Set the E-TTL II meter to Average. Release the flash head from the straight ahead position so that the distance calculation is not used in the metering.
Label your best result from each of the 4 techniques, write down your camera settings for each photograph and post them separately.
Read the two pages (posted in the Lesson 9 section) from the Canon 580EXII or the Canon 600EX manual to help understand what the settings mean
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