This is one of my favorite and most useful tools/apps on my iPhone. Ive used it on everything from commercials, documentaries, and short films. It helps save time on location by previewing FOV without having to change lens after lens after lens.
If you have a bunch of prime lenses, this will help you see which one to use for the look and feel you are after.
Not only does it have presets, it also allows you to customize, which has been very helpful too.
I cant live without this amazing app now. Whenever I pack my cameras, I make sure I bring this along too.
Lastly, I have owned the app for years now and the developers have kept updating and improving on it.
Without this app, youre just wasting you time on location!
broadcast_guy about Artemis Director's Viewfinder, v6.4