Olgierd

You're welcome.

Nice pictures.  You may try taping connectors on your TC.  This trick used to work with TC x1.4 Mk.2 but I'm almost sure It will work also with TC x1.4 Mk.3 because it makes camera to think there's...

Try here:  http://www.photoflex.com/pls

Yes, but so far Flex/Mini doesn't work with 5d3/1dx cameras nor 600 series speedlites. Plus range and accuracy still stinks. I have set and keeping it for now for my Alien Bees and 7d. Once I get...

...in following scenario (tested with 580/580II/600 on three different 5d3 bodies):5d3 with flash on camera, head straight forward with diffuser or small soft box and ETTL set to evaluative -...

Not sure if it will help here, but check if FEC compensation is set on the camera. There is one catch to it. Lets say you have dialed -1 FEC on the camera (e.g. last time you shot with it and...

Very Nice! Do you use ring flash?

Just out of curiosity. Could you please try to shot same scene with ETTL2 flash metering set to Average rather than Evaluative and then let me know if there's any visible difference?Thanks.

Photonius - thanks for your post and links. Very good explanation.

Check 5d3 manual - page 356 (System Map). It says 600EX/600EX-RT.