# 16:9 Screen Vs. 2.37:1 CIH Screen

87268 Views 96 Replies 19 Participants Last post by  tbase1
These drawings show how the two different systems work, when it comes to screen size, image size, and aspect ratio..

The first one is for 2.35:1 DVD's..

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Actually the ideal room also requires careful consideration for room acoustics as well.

For example, a room's length should never be greater than 3x times the height, which is why you see room ratios like 1.0:1.6:2.3.

Then you still have to take the screen height saeating distance into account...

Mark

OK Mark, we are getting closer....

So if the maximum room height is 8' (2.45m),
the maximum room depth should be 8'x3=24' (7.3m),
the maximum screen width 24'/3.68x2.37= 15.5' (4.7m)
the corresponding screen height (at 2.37:1 projection) 6.5' (2.0m)

I then would put the screen 1.5' up from the floor.
At a viewing height of 3.5' (eye level) I will be at about 1/3 of the screen height.
Believe that's OK?

What do you think?

Maikel.
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OK Mark, we are getting closer....

So if the maximum room height is 8' (2.45m),
the maximum room depth should be 8'x3=24' (7.3m),
the maximum screen width 24'/3.68x2.37= 15.5' (4.7m)
the corresponding screen height (at 2.37:1 projection) 6.5' (2.0m)

I then would put the screen 1.5' up from the floor.
At a viewing height of 3.5' (eye level) I will be at about 1/3 of the screen height.
Believe that's OK?

What do you think?

Maikel.
I think the following would work really well (actually know this as I have built one in the past)

Room Ratio

1.0 : 1.6 : 2.3

Room Size

2445mm x 3912mm x 5624mm

Screen Size (MAX)
5624mm / 3.68 x 2.37 = 3622mm x 1528mm

Screen Size (MIN)

5624 / 5.18 x 2.37 = 2573mm x 1086mm

Seating Distances

MAX screen - Not less than 3056mm with 4584 being preferred.
MIN screen - Not less than 2172mm and not farther than 4344mm with 3258mm being preferred.

Surrounds to be at 3x image height...

Mark

PS You wil notice that even with the largest screen size there is roughly 150mm oneach side for the side masking curtains...
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Never even considered CIH, because I also always felt that the lenses were WAY over my budget.

I now see that Mark has made this an affordable endeavor, that I may look into now.

Thanks Mark

Gary
I think the following would work really well (actually know this as I have built one in the past)

Room Ratio

1.0 : 1.6 : 2.3

Room Size

2445mm x 3912mm x 5624mm

Screen Size (MAX)
5624mm / 3.68 x 2.37 = 3622mm x 1528mm

Screen Size (MIN)

5624 / 5.18 x 2.37 = 2573mm x 1086mm

Seating Distances

MAX screen - Not less than 3056mm with 4584 being preferred.
MIN screen - Not less than 2172mm and not farther than 4344mm with 3258mm being preferred.

Surrounds to be at 3x image height...

Mark

PS You wil notice that even with the largest screen size there is roughly 150mm oneach side for the side masking curtains...
Hi Mark,

I do not understand the 3x image height for the surrounds. Having a 9' wide and 3.8' high screen you would have to hang the surrounds 11.4' from the floor???? :unbelievable:

Maikel
Hi Mark,

I do not understand the 3x image height for the surrounds. Having a 9' wide and 3.8' high screen you would have to hang the surrounds 11.4' from the floor???? :unbelievable:

Maikel
No 3x the image height off the screen or 90 degrees to the seating positon of 3x the imaghe height if that makes sense...

Mark
No 3x the image height off the screen or 90 degrees to the seating positon of 3x the imaghe height if that makes sense...

Mark
It does.
Thanks, Mark.
Enough info to do some usefull calculations.

Maikel.
The only problem is with HD where a video scaler is required...That adds lots of money!
Thankfully now, some projectors do not need a scaler for HD...

Mark
Like the Panasonic pt-ae2000 for "only" 2700 \$ or Euro!
OK and for projectors who do not have a scaler for HD, is there a cheep video processor to do do?
The cheapest one that I know of would be the Lumagen Video processor..
You should be able to pick one up for less than \$900.00..
http://www.lumagen.com/testindex.php?module=dvi_details
OK and for projectors who do not have a scaler for HD, is there a cheep video processor to do do?
Your signature suggests that you have not yet bought the Epson, so may I suggest you look at another projector that does offer scaling for HD?

Mark
Your signature suggests that you have not yet bought the Epson, so may I suggest you look at another projector that does offer scaling for HD?

Mark
There is not projector with similar quality and black level at its price delivered here in Egypt. I really like it and I already paid for it, just waiting, should be here mid march.

B rgds
Ahmed Saleh
The cheapest one that I know of would be the Lumagen Video processor..
You should be able to pick one up for less than \$900.00..
http://www.lumagen.com/testindex.php?module=dvi_details
That is a good price, but it does not accept 1080p I think:dontknow:

Is there any quality improvement from a video processor? Rather than just doing VS thing?
Is there any quality improvement from a video processor? Rather than just doing VS thing?
If you spend money on them like the Realto (spelling ?), then yes...

Mark
That is a good price, but it does not accept 1080p I think:dontknow:
To get 1080p you will have to go to the Vision HDP model, at about \$1200.00..

You would save yourself a lot of extra expense if you went for a projector that has VS as Mark suggested..
The Epson is a good projector, but there are other excellent projectors that have VS..
Vertical Stretch - Eliminate those unwanted black bars
I do notice there is no mention of the need for an anamorphic lens, but at least it represents a plug and play solution for CIH...

Mark
wow...very informative thread...think I need to read this over a couple more times.
If there is anything that you don't understand or not sure about...ask away..:T
not entirely related to this thread, as I don't have an anamorphic lens, but I recently replaced my screen with a DIY 2.4:1 screen

for normal 16x9 source material (such as an xbox game) I have black bars on the left and right.
a nice bonus I hadn't thought about was that the mind/eyes don't notice the black bars on the left and right nearly as much as they do top and bottom.
I think this is because when the projector is zoomed to project a 16:9 image, there is no light spill onto the 2.4:1 screen on either side.

for wide screen movies in the 2.4:1 range, I zoom the projector lens and the movie fills the screen perfectly.

WHAT A DIFFERENCE!

Everyone who's seen it thinks it's fantastic!
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