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2019 iMac 5K: Helicon Focus
Related: 2019 iMac 5K, 4K and 5K display, focus stacking, Helicon Focus, iMac, iMac 5K, Macs, memory, video
MPG tested the 2019 iMac 5K 3.6 GHz Intel Core i9 8-core / 128GB / 2TB / Radeon Vega 48. Purchase with 8GB memory, then add 64GB or 128GB OWC memory. See recommended Macs for photographers and videographers.
These tests made possible by loaner gear from B&H Photo and OWC, so please buy your gear at B&H Photo and OWC/MacSales.com using any link from this site or MacPerformanceGuide.com, ditto for OWC/MacSales.com. See also 2019 iMac 5K: Recommended Models and Accessories.
Unsure which Mac to get or how to configure it? Consult with Lloyd.
About
Helicon Focus and Zerene Stacker are both excellent for focus stacking and it takes minutes to do some stacks, so speed here matters a lot to me.
Results
The 2017 iMac 5K takes 70% longer—big win for the 2019 iMac 5K!
This stack uses 20 16-bit 45-megapixel images from the Nikon D850. See Nikon D850 'Focus Shift shooting' feature for Easy Focus Stacking.

"Vega64" should read "Vega48"