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Scope yes, but what size?

post #1 of 10
9/22/07 at 3:05pm
Thread Starter 
Hello all,

I'm working on an upgrade to my HT, and I want to go scope. I have an existing 92" 16x9 Goo screen (80" wide, 45" high.) My projector is currently a Runco CL-700 (720p DLP) mounted 14' from the screen. I jumped on the U85 lens deal. It works with my existing PJ, but being a VC lens, gives me an 87" diagonal 2.35.

My seats are ~11' from the screen and can't practically be moved back.


screen during construction

I'm thinking of repainting a larger screen. If I keep my existing height (45") I'd need to widen it to 108", for a 117" diagonal 2.40. Obviously I'll have to move my PJ back, as I don't have the zoom available in its current position. (Actually, I plan on replacing it with a 1080p unit that works with my U85.)

This proposed setup will give me the same size 16x9 image, but a larger 2.40:1 (constant height, right!).

My question is: Will I be sitting too close to a scope screen? 11 feet from a 108" wide.

Obviously, I will test mount and test view the new PJ before busting up drywall, but should I go smaller?

Thanks in advance.
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post #2 of 10
9/22/07 at 3:07pm
Thread Starter 

Another shot of the room
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post #3 of 10
9/22/07 at 5:51pm
The whole topic of scope ratios has interjected a fair amount of confusion into what appropriate seating distances are these days... at least to my reading. FWIW I'm in just about the same boat as you when it comes to seating distance (at least for my first row), and I'm just about to install a 47 x 110 2.35 Carada. In my room and with my projector (1080p) this is just about as big as I could accomodate, but I don't think that it will be a problem. A great deal depends on your visual acuity and sensitivity to SDE and 'jaggies' in images. For me personally, at this size, it took the jump from 720 lines to 1080 lines for me to no longer be bothered by these artifacts.

Looking at your pictures... I have to admit that to me the way the front wall is designed just cries out for the whole area to be screen... which would probably be too big. I'd definitely darken or otherwise black out the portion on the front surface that isn't 'screen'. Space for curtains? $.02.

Kevin
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post #4 of 10
9/22/07 at 6:02pm
Quote:
Originally Posted by GKevinK View Post

... I have to admit that to me the way the front wall is designed just cries out for the whole area to be screen... which would probably be too big. I'd definitely darken or otherwise black out the portion on the front surface that isn't 'screen'. Space for curtains? $.02.

Agreed. I would make the whole wall a screen, watch for about month or two with different sizes and AR's projected, then mask off with black after the size is locked. There aren't any rules about screen size/seating distance. I would be temped on the masking to NOT paint it black, but to use foamboard wrapped with velveteen and only attach it at the outer edges. This will allow you to change your screen size/AR when you change equipment or your taste changes. My theory is to always leave yourself an easy way to adjust the screen if it is practical, and I think it is in your case. You will never regret having flexibility in screen size IMOHO.
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post #5 of 10
9/22/07 at 6:02pm
Thread Starter 
Quote:
Originally Posted by GKevinK View Post

Space for curtains? $.02.
Kevin

Indeed. There's even an outlet in one of the speaker closets. CIH calls out for a masking system of some sort, I think. I agree with you, curtains would be a natural fit. Automated, eventually.

Quote:


I'd definitely darken or otherwise black out the portion on the front surface that isn't 'screen'.

It actually works out OK. The room is totally light controlled; I had some lights on just for the photograph. I do see your point, though.
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post #6 of 10
9/22/07 at 6:26pm
c-not-k,

Are you going to build a riser for multi level seating or leaving the seating as is?
With the stage the way it is, have you though about building a frame and going AT with all three speakers behind the screen - say SmX? I've just done this and love it.

You can (based on SMPTE) sit as close as 2x the screen height. If your repainting the screen, rather than guess a size and seating distances, try some simple maths.

1. Divide the room's length by any number between 3.68 and 5.18 to find a screen height that fits. (See example at end on post)

2. Times that by 2.37 for the Scope screen width.

3. Times the height by by a number(s not less than 2, but no greater then 4) to find seating distances.

Example - based on a room length of 20'

20 / 4 = 5 (screen height)
5 x 2.37= 11.85 (screen width)
5 x 2.5 = 12.5 (front row)
5 x 3.5 = 17.5 (back row) or 5 x 3.68 = 36degrees (the so called preferred viewing angle for Scope)...

Mark
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post #7 of 10
9/22/07 at 7:51pm
Thread Starter 
Quote:
Originally Posted by CAVX View Post

c-not-k,

Are you going to build a riser for multi level seating or leaving the seating as is?

There's a bar behind the seats, so no riser/second row.



Quote:


With the stage the way it is, have you though about building a frame and going AT with all three speakers behind the screen - say SmX? I've just done this and love it.

In hindsight, maybe. I started this theater before discovering this forum (hence the change to CIH, for example).

Thanks for the formulas. I'll run the numbers and see what it looks like.
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post #8 of 10
9/22/07 at 9:10pm
Your welcome, I hope that they work out for you...

Mark
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post #9 of 10
9/23/07 at 1:25am
You guys who are experienced with SC screens.
Would a 125" Diagonal 2.35:1 screen be too big for me? My room is 4meters W and 6 meters L. I sit aprox. 4.2 meters from my current 100" 16:9 screen now. I was thinking of going CIH
How big would a 16:9 screen be with the same lenght as the 2.35:1 screen if i need to start with zooming to begin with?

Thanks
LL
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post #10 of 10
9/23/07 at 2:28am
If your happy with the height (and your projector has the zoom range, I would just go wider, because it looks like you have the width...

Mark
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