OK, I have used Helicon Focus as well as CS4 for various tries at focus stacking and I observe that generally the best results I have seen so far are in those image that have a minimum of magnification change between near and far. Of course this seems intuitively obvious, since the software has less to do if the magnification does not change so much.
So, that brings me to the following question:
Is it better, in macro subjects, to step through the subject with a fixed magnification, through use of something like a focusing stage, or is it better to focus on different depths of the subject by focusing, changing the lens to sensor distance and thus the magnification.
I think that I might have just answered my own question, but does anybody have experience in trying the two different approaches?