It works great on my D500 and 300 PF but my process might be a little different. 1. I always use a tripod. I am not physically capable of keeping the camera still enough to keep the focus on the point I want. Even breathing in and out changes the focal point! 2. I use the lens in AF. 3. I often use ...

Were you able to get it to work? My Tube is coming Wednesday and I really want to use in on my 300 PF.

Thanks!