I decided I wanted to get a little more subject isolation than I could with the 280/4. I remembered that, when I sold my V-series ‘blad gear, I’d hung on to a couple of lenses. I went looking and found a Zeiss 500/8 Apo. I put it on the IR camera and made some images. The lens struggles to keep up with the a7RII’s fine pixel pitch, but it’s serviceable if the prints aren’t too big.