I am split ....

The panel fits beautifully

now the crux of the matter with my Sony Alpha 58:

You screw it on the focus ring when now activated the Focus, the tulip shape rotates, so that it can not be prevented that any true backlight on the lens, because the cut-outs are now exactly where the light is coming from, you can just not readjust it. For my case, an absolute knock-out criterion.

It may be that in other cams, the operating principle is different with the focus ring, but goes with the Sony Alpha 58's just not perfect, therefore only 3 stars