Back Button focus and E-TTL

Wilt wrote in post #16821985
I was not referring to the AREA of the spot, but merely the LOCATION of the metered spot

Vetteography wrote in post #16807402
Ok, so I admit right from the beginning that I am a flash n00b.

I went through the "I shoot in natural light because I can't use flash" stage and then the "I want to learn" stage before getting to "Damnit, I AM going to get this or the world will burn" stage where I am now.

That means I don't know sh...er... a lot.

I have not had any real experience with, and less understanding of, E-TTL but want to change that.

I was having issue with lackluster performance when experimenting using E-TTL, and was surfing around trying to find out why.

It turns out that if you are like me and have switched to back button focusing, you sometimes focus and take your thumb off the button before shooting. Did you know that you are causing the E-TTL system to go into evaluative mode instead of metering at the focus point?

Well... now you do. I thought I would share in case there are others like me who are trying to learn.

This page explains it very nicely: http://www.dlcphotogra​phy.net/ETTL/ETTL.htm