Bob Bla[y]lock- How is the focusing screen installed?
Unfortunately, it does not come with useful instructions. I found reference to it somewhere else on this forum, leading to enough information for me to figure out out for myself. I don't feel like looking for that now, which is odd given that I did feel like trying to take this picture of my own camera, to show you the most important thing about the procedure.
Seen reflected in the camera's mirror, circled in red, is a wire clip. That clip holds the front (toward the lens) edge of the focusing screen. Gently grasping the middle that clip with a pair of tweezers (my screen came with a pair of plastic soft-tipped tweezers that were obviously intended for this very purpose) you push the clip toward the back of the camera, then it hinges downward, releasing the focus screen. You carefully remove the old focus screen, insert the new one in its place, and then manipulate that clip back up into its original position.
You want to be very careful, of course, not to let anything touch the mirror while you are doing this.
I think Nikon assumed that these who would buy a D3200 would mostly be the type who would never use anything on it other than a modern, auto-focus lens; so they equipped it with a focusing screen that was optimized to give the brightest, clearest display, at the expense of usefully showing what is in focus and what is not. The Bresson screen is much more like a traditional SLR screen, a little less bright, a little less clear, but it much more clearly show in-focus elements in focus and out-of-focus elements out of focus. Even when using my stock autofocus lens, I like this screen much more. There is something satisfying about watching the autofocus mechanism bring the subject into focus.
