Originally Posted by Crabalocker
OP, here's a picture of my screen with me standing next to it. the screen size is 75" high by 133" wide. For perspective I'm 6'4" and weigh 280lbs. (pre-calibration...and yes, a new bulb) I can't remember what projector this was...it's either my 8500ub, 8350 or my W7000??? (I'll soon take pictures of my X-55)
........ but beware...it's highly unwatchable and you should never go this big...the picture quality looks awful at this size! (and yes, the reflections from the floor are distracting....but you can't see them when sitting on the couch, the coffee table blocks them out)
No offense but that picture doesn't provide any useful information. I can make a picture of any brightness look that bright in a photograph. In fact most cameras, in their default settings, will make a picture of any brightness look about like that in a photograph. Now I'm not saying your misrepresenting anything, just that others can't really draw any conclusions about absolute brightness of projected images from photographs ever.
Originally Posted by Seegs108
There are no naysayers. Just people offering safe advice.
Yup like I said before there's two different approaches being argued here, there are those like Crabalocker advising to just shoot your projector at a wall and see how big you can make it and still be happy. This approach works great, and I'm sure all us "naysayers" would advise that approach if you already have a projector
. If you've already got a projector the "shoot and check" procedure is great, because you're all absolutely right that what matters is what you see and what you're happy with. And in fact it's exactly what the OP is planning to do:
Originally Posted by metalguy
Now the way I am shooting at only allows me to go 140, but I will be switching it so I can shoot longer and put the projector farther back, and then I will see what 150 plus looks like.
So the OP is already planning on doing the "shoot and check" procedure, and no one here has told him not to, nor has anyone said what he's doing won't work.
However the OP actually asked something different. He didn't ask for advice on if his projector could light up 150" screen, he asked:
So is that because people cant afford the bigger screens, and don't want to do the DIY route, or Can these projectors just no bring enough brightness?
But the thing is i want to understand what I am getting to without buying the screen if it will be to big for the current projector or anything even new.
I have been specifically addressing the second part, which I would paraphrase as, "How can you know, without buying a projector and trying it yourself, if a given projector is capable of lighting a given screen size?"
This is an entirely different question than the "shoot and check" proponents are answering, and one that can only be answered (without potentially great expense) by looking at the numbers. Ideally a given user would have an idea of how many foot-Lamberts they are happy with. If you already have, or have access to a setup you're happy with the brightness of, I'd advise getting a light meter and figuring out how many ftL you're getting. That way you can back calculate the Lumen requirements and know for sure if a new projector you purchase is capable of satisfactory brightness before you spend a lot of money.
However if you don't have a setup you're happy with, and don't have access to one to see for yourself, well this is where SMPTE/THX/Fox/DCI standards become useful, they are a known benchmark, and if you don't have any personal experience to go off of
, they are a very good starting point for designing a theater.