Get Zeiss 135mm f/2 APO-Sonnar at B&H Photo.
Intrigued by the focus stacking results with the Pentax K1 in SuperRes mode using a mediocre lens, I decided to repeat the exercise using the Nikon D810 (which has no SuperRes mode) + the Zeiss 135mm f/2 APO-Sonnar.
The Zeiss 135/2 APO-Sonnar is all but an Otus and right now it has a chunky $400 rebate bringing it down to only about $1722. The Zeiss 135/2 APO focuses down to 1:4 while maintaining supreme quality, which is why I used it for this subject.
This example still-life stacks 15 exposures from the Nikon D810, full frame.
Full actual pixels resolution (from full frame) of 29 megapixels on the review page can be viewed with outstanding jaw-dropping detail on an iMac 5K.
Includes for comparison the first frame of the series to show the huge gains in DoF; toggle to see just how little depth of field there is at f/9, and how focus stacking delivers.
Zerene Stacker was used for focus stacking (DMAP). Impressively fast and straightforward, this was the first time I had ever used it and yet I had the stack done in under 5 minutes, a testament to simple but thoughtful design.