Aspect Ratio Guide Solutions

Has anyone come up with a great solution for filming with aspect ratio guide lines?
I'm looking for something practical without using an EVF.
I've read about:
. clear scotch tape
. 3M static film cut in strips
. black electrical tape(yikes!)
Please do tell.
cheers.
I'm looking for something practical without using an EVF.
I've read about:
. clear scotch tape
. 3M static film cut in strips
. black electrical tape(yikes!)
Please do tell.
cheers.