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I really don't understand your hostility to this idea that I personally find it easier to see when two halves of an image are aligned, as opposed to determining when the image is sharp or blurry. I don't actually NEED to have used f/1.2 lenses with both types of screens to be able to make that claim. My personal experience with the lenses I have used supports my preference.
And for what it's worth, I use an Eg-S screen on my 5D2 with an 85/1.2L II, and there is *no* way for me to see critical focus wide open. That screen...Show more →
My hostility is towards the increase in likely hood around here lately that anything one suggests will be instantly poo-pooed. I, for one, an not talking out of my ass:
EE-S Product Description:
"The Ee-S Super Precision focusing screen is designed to facilitate manual focusing with high-speed lenses (f/2.8 or faster). The Ee-S screen has finer microlenses than the Ee-A or Ee-D options, along with a steeper parabola of focus to make the image pop in and out of focus more vividly in the viewfinder; however, the Ee-S focusing screen is not recommended for slower lenses because it's not very bright."
And yes, in order to make a valid claim about something, there is a requirement to have tried it first, otherwise it is known as conjecture. Check my profile, I have several fast manual focus only lenses that I use in conjunction with the E*-S screen, and have tried them with split prism screens as well. Your profile suggests that you only own AF lenses, which also leads me to believe that you are, in fact, talking out of your ass. Frankly, I see this type of behavior out of you a lot around here. Additionally, I made a point of saying that it was my opinion more than once, as that is nothing more than what it is. And finally, it was you who initially claimed that I was wrong, so to turn it around to say that I believe my way is the only way is pure hypocrisy.
A split prism shows you a sharp image but in two halves. You know it's focused if the halves are aligned.
That may well be the case with a lens that is f/2.8, but certainly not at f/1.2. I HAVE TRIED IT.
I apologize to the OP and other interested parties for going down this road, this type of stuff just irks me. Maybe he was trying to goat me into this... If so, well done.