wszystkie EX'y wspolpracuja z seria EOS

"I briefly tested the 20D with a 380EX speedlite and exposure and color balance seemed fine. I can't comment yet on the difference between E-TTL (10D) and E-TTL II (20D), but in the brief tests I did I didn't see any huge difference from the results with the 10D. The illuminator on the 380EX enabled autofocus in total darkness without a problem. The 20D body (like the 10D body) has no dedicated AF illuminator. In conditions where there isn't enough light for AF, the built in flash will strobe to provide illumination. In "green zone" and PIC modes the built in flash will pop up automatically. In the creative modes (M, Tv, Av, P etc.) the flash can be manually activated."

zrodlo - http://www.bobatkins.com/photography...al/eos20d.html