digit-up wrote:
Fuji makes a 2X converter that works well on the 100 to 400, and it is o.k. For the 80mm macro as well. I don’t know if it is compatible with any other Fuji lenses. It doesn’t mate with any of my other Fuji lenses, as far as I know. I’ve been a pentaxian since my stint in Vietnam(1968-1969) and still love their stuff, but recently got well into FUJI. You should like the x-T 3, imho... RJM