I met someone from Carl Zeiss Microscopy while speaking (in my capacity as Wikimedian in Residence at the Royal Society of Chemistry) at a science conference in thsi summer, and discussed with them the possibility of using some of the images from their slides, on Wikipedia.
After further discussion, the company have now open-licensed a number of images, with the promise of more to follow.
I've uploaded most of the images to:
https://commons.wikimedia.org/wiki/Category:Images_donated_by_Carl_Zeiss_Mic...
and they include modern and vintage Zeiss microscopes, as well as portraits of people associated with Zeiss, educatonal posters, and more, Please make use of them