Get the Coastal Optics 60mm f/4 UV-VIS-IR APO MACRO from Jenoptik (please mention diglloyd.com).
I’ve added to my review of the Coastal Optics 60mm f/4 UV-VIS-IR APO macro* in DAP using the Sony A7R II as a convenient platform** (the study could be done as well on Canon 5DS R or Nikon D810 and I may still take it up on the Canon 5DS R).
The Coastal 60/4 is the best corrected lens for color out there, consisting mostly off fluorite elements. Leica APO lenses do not even remotely approach its level of correction.
This is a technical study to assess lens performance, namely sharpness and color correction. But I found something very interesting with f/16.
* As per longstanding policy to keep publications cohesive, lens tests regardless of camera body used always go into their native-platform guides, e.g. Nikon DSLR lenses go into DAP. See Which Content is in WHICH PUBLICATION?.
** Dang I love that 12.5X EVF.... when are NiCanon going to get a clue that an optical viewfinder sucks for many purposes and users.