Thanks for that info.
Question: Do you set the 90 mm f2.8 to manual or auto focus so that the Helicon Remote can control the focal point?

Thanks very much. I will try it out this week and let you know the results. Plus, assuming it works as it should, I'll post this to the SONY forums where a number of people are upset about the same lack of functionality in the A1 camera. It's a bit ironic since some users are noting that A7RIII and ...

I recently got a Sony A1 with the 90 mm Sony Macro and was stunned to find that it has no built in focus stacking function! It appears that Helicon Remote might be the ticket for this camera (the A1 is not listed as supported but other posts in this forum indicate people have been successful using ...