Changing lens simulator
Suppose we did a photo with a 15 mm focal length. It would be interesting a simple plug in which we change the focal. Say:"We used 15 millimeters and now we will see the photo as if we used 85 mm.
There is a demonstrative program of Nikon that does it. The plug in should be similar. The address of nikon's feature is: https://www.nikon.it/it_IT/learn_explore/nikkor_lens_simulator.page. The Nikon program does not let us change photo, while the plug in should let to do.