Issue report:
100/2.8 Macro focus stacking fail.
Observations:
1. arrow key (up/down/left/right) focus adjustment works. Script execution OK and pictures are taken. But there is no AF operation during the execution of script. Focus is not changed. I've tried 1:1 and 3m, both fail. My conclusion -- something is wrong between the script and the focus command.
2. Everything works fine with other lenses, 24-70/4L, 24/2.8 IS, even old 50/2.5 macro (no focus report but everything else is OK).
April 09 nightly build.
First I should write full name of the lens. It is not 100/2.8 macro. It is 100/2.8 macro USM.
After more tests, I found 100/2.8 macro USM works with step size mode 2/3, but not step size mode 1. I was confused by the name "step size". But since it is defined by Canon, we had to follow it anyway. However, actual unit is not related to that number!
Step size mode 1 means extremely fine, step size mode 2 means fine, step size mode 3 means coarse. There's nothing true about the number.
24-70/4L in step size mode 1 gives approximately 40 steps from Inf to 5m.
70-200/4L in step size mode 1 gives approximately 260 steps from Inf to 5m. In step size mode 2 gives approximately 27 steps from Inf to 5m.
ML UI also leads to some confusion. FF-- is sending focus command in step size mode with larger number. FF- is sending focus command in current step size mode. And ML counts the focus steps in a mixed way. But that is not correct. There is no fixed relation among different step size modes. I found it varies from lens to lens.
For some temporally fix about this issue, I would suggest modifying the field Focus stacking-->Focus steps /picture.
Current version there is only 1-10. This is too small for step size 1 setting. 1-30 or more might be required.
And in the long run I think the UI or focus commands behind should be modified to avoid mixing of focus command in different step size settings.
And sorry I don't have other Canon DSLR with me right now. But now I guess this is not 6D specific. It should be an issue with all other camera models as well.