I just want to give a short review of this... Steve reeeeeally sells this course short... The implication that you need one of the aforementioned cameras is really a misconception... Although the course is about Nikon's Focus Shift focusing.... That's a misnomer. Of the 20 videos in the course, 1 is about the Nikon focus shift settings... There are several different means of creating a stack of images for photo stacking, Nikon's in-camera method is one... Steve's course should really be named Focus Stacking from A to Z...
The course covers the entire workflow using all the various software between Lightroom, Photoshop, Helicon Focus, and ZereneStacker.... He covers all the considerations in focus stacking and is probably the best course of the subject that I've seen... The Nikon Focus Shifting portion is less than 5% of the entire course...
At <$15 for the 20 video, this is really a bargain in understanding the workflow in getting crystal sharp images using focus stacking as a technique
I always recommend Steve's stuff... and this is no exception...