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Mastering Canon EOS Flash Photography, 2nd Edition by NK Guy

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Appendix A: Flash Units for Canon EOS

Speedlites for film and digital cameras (E-TTL)

These flash units are compatible with all Canon EOS type A cameras that support E-TTL and E-TTL II metering. Some can revert to legacy TTL mode for film cameras. However, the 90EX, 270EX, 270EX II, 320EX, 430EX III, and 430EX III-RT are E-TTL only.

Speedlite 90EX

This miniature unit seems like a fairly useless add-on for the tiny EOS M series of mirrorless cameras. It’s powered by twin AAA cells, giving it a very ponderous recycle time. But it has a trick up its sleeve—it can serve as an optical wireless E-TTL master, making it a portable and affordable solution for wireless flash, albeit one with limited range. Canon should have marketed this one as a Speedlite ...

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