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How many layers to get the full focus rack Zim?
I made seven exposures at f/11. I didn't rack the focus, though: since the bowl has significant depth and the stand holds it with significant rake, I just focused on seven points on a line from top to bottom. Some of the exposures may be redundant. The auto-generated layer masks were insanely complex, but the end result is very good.
BTW, Jeff, I shot this with the D800 mounted on my new RRS tripod setup, per your recommendation: I love it. Not having a center column while still being able to work at a comfortable standing height (and I've got only two of the three deployable leg segments extended!) makes all the difference in the world.