Originally Posted by krichter1
I'm simply saying the benefits (I'm only book smart on the subject in terms of an HP screen so you'll have to get others like Zombie to feedback actual practical application & benefit), are more of an optical illusion and the laws of physics don't apply to your presumed outcome. If you clamp the iris you will get better blacks; but less light output to boot and because the physical stating point of both blacks and whites are raised from using an HP screen, you'll never be able to get the best of both worlds as your impression seems to imply (including OLED performance out of a PJ using current technology). There's no such screen/PJ combo that will do both (again IMO your room was the best thing you did in the attaining the best (of both); not that an HP will hurt (a lot on this forum swear by them), but again I don't own one so others will have to provide input on real world application benefits.
By not getting the best of both do you mean not being able to get the brightest whites and the darkest blacks?
I'll ignore the dynamic iris for the moment as it complicates things.
Let's say a projector can provide 20 ftL for white and 0.001 ftL for black on a 1.0 gain screen and the room doesn't have any other lights on.
If you now go to a High Power and sit at a 2.0 gain position you close the iris to put out half as much light for white. Due to the physics and using a high percentage of controlled light through the engine vs off-angle light (like cutting the sides off a Bell Curve) the black is cut by more than 50% when closing the iris like this. Let's say the projector goes from 20k:1 on/off CR to 30k:1.
Now you still have 20 ftL for white for a person sitting at the 2.0 gain position, but 0.00067 for black.
Also, if you ever wanted to go brighter than 20 ftL you could with the High Power.
The dynamic iris complicates thing because the higher native on/off CR is with the iris all the way closed, but the higher dynamic on/off CR is with the manual iris set to 0. Likely more artifacts from moving across a bigger range, but a bigger range none the less.