jerryc41 wrote:
The only thing that has to be in focus with the diopter adjustment is the writing inside the viewfinder. Actually, you might find it easier to adjust it with the lens cap on. Turn on the camera, make sure you have some writing in there, and get a sharp focus.
Take the lens off, then you can concentrate on getting the viewfinder icons sharp, without getting confused by the image a lens would give-that is the proper way,