I've learned the single point AF on the D7100 is nothing but trouble & use "dynamic or 3D," for viewfinder distance shots. (I'm also well aware of locking a camera to a pod/mirror up/timer countdown or remote click.)
My remark about the D5200/better was because, the only "wow" shot between the two camera bodies was a very low light shot of a blue heron using the D5200. Out of 100's to 1000's of shots between the two, I'm very much under impressed.
With the severely outdated bodies, I get what I expect, & sometimes more.
Yes...feel free to joke on my login handle, & I realize that some of my opinion may step on a few toes. Laugh away.
Broadly stated..... Flora pistils, pollen....it seems that 24mp only adds muck, not more detail. My Micro collection only includes.
1. Nikkor 60/2.8D (never use)
2. Nikkor 85/2.8PC-D
3 Vivitar 100/3.5 (yes, it is "plastic fantastic.)
4. Nikkor 105/F4/AI
5. Nikkor 200/F4 Micro/AI (w/reversed 4t)
6. Series One 90-180/F4.5/Ai (yes, it' worth it's weight...2.2lbs)
If there is a problem with my D7100, Melville, NY is a nightmare. A local pro told me similar problems about her D7100. Now it's problems with her D610.
I'm both hopeful & somewhat doubtful about a DF.