Must say I am impressed by Zerene Stacker.
Until recent I've been using EOS 7D and EOS 5D Mk II for stacking. Worked just fine. No problems at all.
A month ago I bought a secondhand EOS 5Ds R. It's a great camera, some would say overkill for sure, but I went for it.
It's a dream to work with, but the files are huge. 300+ Mb for full resolution TIFF.
Ran in to some problems with Zerene, but sorted them out after a while.
What a great job that software do....
A forum to ask questions, post setups, and generally discuss anything having to do with photomacrography and photomicroscopy.