Originally Posted by noob00224
To use madvr's DTM where the real nits is required. Screen is Cinegrey 3D which the manufacturer claims is 1.2, but the 5D was supposed to be 1.5 and in testing was 1.0. I don't know if the the 3D is also 33% as well.
I can understand that you want to know your screen's nits, but you don't need to know the gain to know the nits.
If you just place your i1 Display Pro back from the screen a bit and point it at your screen from a similar viewing angle as you sit at, it will read and tell you the nits of your screen including the gain since it's reading from the screen.
I can read my screen with a normal light meter, held up against the screen and reading from the lens and I get 20 foot candles.
When I then use my i1 display Pro from about 7ft back reading my screen from the same angle that I view it from with my eyes, I read 75 nits. This would be 22 foot lamberts which is a 10% higher reading than the light meter got from the lens.
And my screen claims that it's 1.1 gain so it seems to check out that the i1 Display Pro is reading the nits close enough.
Unless you have a really high end light meter, I would say the i1 Display Pro should be reading the nits accurately enough. Or at least just as accurately as you trying to find the gain of your screen vs a piece of white paper and then applying that to your light meter reading to find your nits.
There are too many variables with your method that I do not believe you would get a more accurate result than just reading your screen with the i1 Display Pro and measuring the nits directly.