Canon 5D setting

[lennon33x]

So, I ran into something that I want to see if anyone can answer. In my custom functions setting on my 5D (classic), it has ETTL as average and evaluative. First question: what's the difference? Second question: does it matter if my strobes aren't ETTL and the first question is a moot one?

 

[Rye]

1: ETTL average takes the entire frame into account but gives bias to the center of the frame when measuring exposure. ETTL does basically the same but emphasizes the focal point instead of the center. Same idea whether using ETTL flash or no flash at all.

2: Yes, your first question is moot since with non-ETTL (or manual) flash you're measuring the exposure yourself or using a light meter or rather than the camera measuring exposure "Through The Lens".

 

[lennon33x]

1: ETTL average takes the entire frame into account but gives bias to the center of the frame when measuring exposure. ETTL does basically the same but emphasizes the focal point instead of the center. Same idea whether using ETTL flash or no flash at all. 2: Yes, your first question is moot since with non-ETTL (or manual) flash you're measuring the exposure yourself or using a light meter or rather than the camera measuring exposure "Through The Lens".

Thanks!