Interesting find.
Not exactly suitable for field use, but seems hard to beat for low-to-mid range studio work.
I still consider the Laowa (on order to be shipped this month) to be
the primo field choice (to replace my reverse-lens shooting upon arrival).
What is especially interesting is the even bigger picture (pardon the pun): there are now
two high-mag macro zoom alternatives apparently developed in 2017 for 2018 release.
Hope Nikon delivers new macro options this year as well ...
In the meantime this lens seems to be peerless for low/mid range studio ultra-macro application. However, given the price, I will look for a
used Apla Macro Switar 105mm on Ebay over the ensuing months/year