Is that one of the 650-1300mm refractors, or a better quality lens?
Why would it not shoot in RAW?
The P900 is a camera. I looked at the mirror lenses a while ago and also looked at the mega zoom cameras. In many cases the cameras had better IQ and more zoom and flexibility than an inexpensive lens. For instance, the P900 goes out to 2000mm. That's just insane and the quality looks to be better as well.