The best replacement for ettl is ttl.

The best alternatives to ettl are rated as following:
★★★★★  ttl
★★★  ittl
★★  ettl ii
★★  manual flash
★★  ttl flash
★  manual mode
  ttl canon
  ettl

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Speaking about ettl, one probably shouldn't forget about radio trigger.

Other search terms related to ettl and their ratings are:
★★★★★ radio trigger
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