On 2018-03-25 08:50:33 +0000, RichA said:

Seriously, this lens makes a nod to Canon. The fluorite element.
Fluorite is soft, hard to polish and expensive. However, they still
have no fluoro-crown (ED glass) hybrid that can yet match its desirable
characteristics to make aberration reduced lenses. Canon has used it
for decades in high-end lenses.

Ken has the review up soo just get them chequebooks ready!

https://kenrockwell.com/nikon/180-400mm.htm
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teleportation kills