Quote Originally Posted by ameerat42 View Post
Strange, for sure!

Q1: That larger, red square corresponds in size to the smaller white square in the next picture?
Q2: Could you make that zone smaller, for more precise spot focusing?
Q3: There is another, unexplained red square in the 3rd picture, along with the smaller white one.

More tests: Try it again on an inanimate object of similar size and depth.
Wondering: In the flat screen test, could some other AF point/zone be determining the focus?
Hi Am

Thanks for your reply.

Q1-Answer: Yes, in #1 the Red Rectangle is how Canon's DPP V4 represents the Live View AF rectangle on the full size image. The frog image is a screen capture of part of the full size (100%) image.
Q2-Answer: Not in Live View - you only get the choice to spot focus & small spot focus in normal TTL mode when looking through the Viewfinder.
Q3-Answer: The small White Rectangle is the illustration in the Canon User Manual of where the AF Rectangle is. The Red Rectangle in #3 is where Canon's DPP V4 is telling me the Live View AF rectangle was on image of my computer screen which was displaying the pdf of the Canon User Manual.

Cheers

Dennis