I have a Nikon P900 that I use mostly for birds. I find the 2000mm equivalent wonderful. At the long end it will only focus from 5 meters to infinity. At the short end (24mm) it will focus very close and make an nice large image, but if I try to get that close it scares the butterfly.

I got a +1 diopter close up lens. It works reasonably well but there are two problems. The first is that for butterflies getting with 1 meter is too close. I would like a +1/2 or even +1/4 but I can't find one. Are they available? I need a 67mm filter size. Being 2 meters away with the 2000mm zoom will get a nice size image. The second is that the autofocus is close but not correct. It seems to focus a little too deep when the close up lens is on. Any ideas?