the adequate distance to view the game...

[Kakashi]

Originally Posted by raaaid

that if you want to use a realistic size but you can still use a wide one with the same effect

or the opposite zoom

No you can't. your idea to keep the proper field of view, that is through angles from your eyes to the screen, which would generate the in game field of view to be "correct" as you suggested in original posts will HAVE to result in realistic sizes.

Having said that, using 2 different screens (a 17inch diameter one, and a 47inch one) will show a specific object with the EXACT same size on BOTH screens if you maintain the same distance with both screens. You'll just have a VERY RESTRICTED field of view on the 17 inch screen.