Nikon has released a new firmware upgradet for the Zf. There are a few enhancements that really make this one particular upgrade exciting.
Fixed an issue that would cause the camera to stop responding or to display error messages when operating the camera after selecting any of the following Picture Controls and then choosing a [Multiple exposure mode] other than [Off]:
https://downloadcenter.nikonimglib.com/en/download/fw/559.html
Thanks for the informative review. This lens is going to be a game changer in the wide angle arena.
We will be selling it on popflash.com
https://www.popflash.com/voigtlander-lenses/