Olympus FW 4.0. Focus Stacking. 60mm macro. F4 with interval at "4"

The other day I reported (here) on using the new focus stacking feature available on a couple of Olympus cameras.  I used the EM-1 and 60mm macro (120mm equivalent) with a focus interval setting of "2" (range is 1 to 10) and an aperture of F2.8 (maximum lens aperture) to keep the background as blurry as possible.

Yesterday I tried the above gear at F4 and an interval setting of "4".  The "4" places a greater distance between focusing planes for each of the 8 bracketing shots. To prevent blur lines between focusing distances I experimented with F4, rather than F2.8, for the greater depth of field provided by a smaller aperture. The backlit palm frond (picture #2 below) shows sharper focus throughout compared with the image taken with with F2.8 at interval "2".

Since I want the blurriest background possible, the next experiment will likely revert to F2.8, but perhaps with an interval of "5", as I have seen "5" recommended on the internet somewhere.

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