Got the idea from https://www.thingiverse.com/thing:1999681 and designed an equivalent for my Sony alpha. can be used with any camera with the same flash bracket I suppose.

I made it in two parts easily printable. I made it in black ABS and lined the screen with tinfoil. Drawback you may consider is that if the articulation is loose the screen falls a bit.

Perfect adjustment is when you don't have a brightly lighted strip on top of the picture.. but just under that. Might want one or two tries.

Enjoy please post your makes