Atomos Ninja 2 EVF
I noticed when filming outside with my Atomos Ninja 2 that, because the screen was so reflective, it was hard to see what was happening on the monitor.
I looked on the internet for solutions, but I couldn't find anything of use, so I decided to model and print my own.
To print one for yourself, download the STLs and import them into your print controller.
I modelled this using SolidWorks 2013, so to check out the source and make modifications you'll need to download all the SLDPRT and SLDASM files.