I have a P900 that I use for birding. It's great for carrying around and not so great when (as usual) the light is low. I'm considering using an alternate set-up, for example a D500 coupled with a fixed 300mm prime lens. Or maybe I should go with a 400mm lens. Or a 500mm. Or something else.
Here's what I would like to be able to do but can't: I would like to be able to look through my P900, zoom out, and know when I reach the equivalent of a 300 mm fixed lens. Then I could look through the viewfinder and assess whether 300mm is sufficient, or instead whether I should be looking at a 400mm outfit, or a 500mm, or what have you. I could solve this problem much more easily if I had a 300mm lens (or 400, or 500) handy -- just try to replicate in the P900 the image you see in 300mm lens. Alas, I am currently overseas with no such resources available.
Stated differently, is there a way to glean a fixed lens equivalency from any P900 setting or photo data? I tried looking at photo metadata (specifically, the "focal length" field) from my P900 using Photoshop but couldn't figure it out. I also searched the display settings in the P900 in hopes that I could see the equivalency displayed as I zoomed in an out, but no such luck.