The 540EZ system is a clip-on type flash unit with a large light output, maximum GNo = 54 (at ISO 100-m TELE 105 mm). Characteristically, this system is a top-class flash unit that features ten new or improved functions based or the desires and opinions of current users of the 430EZ, and that answers user complaints about the 430EZ with regard to operating performance. In particular, this system permits high-level flash photography due to its compatibility with 5-point focusing and 3-point TTL metering when mounted on the EOS-1N/EOS-1N RS.

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