130" or bigger for the following PJs. - AVS Forum
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post #1 of 13 Old 09-28-2011, 12:16 PM - Thread Starter
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I can get away with bigger screen in my space as I am not limited yet by PJ mounting distance or seating. The two PJ's I am interested in are Panny 4000 and JVC 250. The screens I am considering will come from Da-Lite.
At what distance would I need to mount either of the PJs to light up a screen of that size?
Will one do a better job than the other?
Can I go bigger?
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post #2 of 13 Old 09-28-2011, 12:22 PM
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There are a lot of questions to be answered for "can you go bigger". If you have unlimited throw distance, of course you can go bigger. Will you like the picture? How much ftL will reach the screen? Does the screen have a gain? How's ambient light control?

I do about 170" 2.43 and I'm happy with it. I don't even use a screen!

Never buy a screen without using the projector on said wall first.

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post #3 of 13 Old 09-28-2011, 01:04 PM - Thread Starter
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So PJ always comes first? Why?
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post #4 of 13 Old 09-28-2011, 01:20 PM
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Quote:
Originally Posted by crazyravr View Post

So PJ always comes first? Why?

My thoughts are to make sure you get a size you are comfortable with; that is, that you don't end up with the first row of an imax effect. And to ensure you get a screen that has the gain and other properties you determine you need.
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post #5 of 13 Old 09-28-2011, 06:22 PM
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1. Determine pjs REAL lumen output.

2. Divide that by 16 to get the maximum square footage you can have and get the recommended 16ftL luminance.

3. Factor room conditions and seating width to determine acceptable gain characteristics

3. Multiply #2 by screen gain

4. Multiply by 144 to get max sq inches.

5. Wrk our max screen size for that pj and gain (height in inches * width in inches)
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post #6 of 13 Old 09-28-2011, 06:54 PM
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Quote:
Originally Posted by GetGray View Post

1. Determine pjs REAL lumen output.

2. Divide that by 16 to get the maximum square footage you can have and get the recommended 16ftL luminance.

3. Factor room conditions and seating width to determine acceptable gain characteristics

3. Multiply #2 by screen gain

4. Multiply by 144 to get max sq inches.

5. Wrk our max screen size for that pj and gain (height in inches * width in inches)

Factor-in the lamp dimming ratio to allow at least 12 fl minimum requirement (more for 3D). You should get around 20 fl in order to meet the minimum 12 fl at 40% degradation of the brightness. Usually this occurs at 500-600 lamp hours for most pjs.
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post #7 of 13 Old 09-28-2011, 06:57 PM
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Agree
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post #8 of 13 Old 09-28-2011, 06:58 PM
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Quote:
Originally Posted by elmalloc View Post

There are a lot of questions to be answered for "can you go bigger". If you have unlimited throw distance, of course you can go bigger. Will you like the picture? How much ftL will reach the screen? Does the screen have a gain? How's ambient light control?

I do about 170" 2.43 and I'm happy with it. I don't even use a screen!

Never buy a screen without using the projector on said wall first.

What he said.

I have the Panasonic and a 136" 1.4 gain screen. If you're going big with that PJ go for the higher gain. I get a very good picture for not being optimal conditions. Oh and that's in eco-mode too.


The above post is 100% medically accurate


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post #9 of 13 Old 09-28-2011, 07:01 PM
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I dislike retroreflective high gain screens. Unless you have only one seat and don't mind the pj shooting over the top of your head. Angular reflective ok. Stewart has a new 1.7 thats not bad.
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post #10 of 13 Old 09-28-2011, 09:31 PM
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I have the Mitsubishi HC4000 which is throwing a 115x49 CIH image. This is the equivalent of a 130" 115x64 in the 16:9 aspect ratio. My projector is at 13.5 ft and running in best mode with low lamp. There is a slight drop in brightness which is noticeable and needs to be compensated by slightly increasing the screen gain and changing the calibration of gamma and brightness. Otherwise the image is superb and the CinemaScope effect is amazing.
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post #11 of 13 Old 09-29-2011, 07:44 AM - Thread Starter
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Quote:
Originally Posted by GetGray View Post

1. Determine pjs REAL lumen output.

2. Divide that by 16 to get the maximum square footage you can have and get the recommended 16ftL luminance.

3. Factor room conditions and seating width to determine acceptable gain characteristics

3. Multiply #2 by screen gain

4. Multiply by 144 to get max sq inches.

5. Wrk our max screen size for that pj and gain (height in inches * width in inches)

Thank you very much for this info. This will help a lot.
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post #12 of 13 Old 09-29-2011, 07:45 AM - Thread Starter
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Quote:
Originally Posted by wizzack View Post

What he said.

I have the Panasonic and a 136" 1.4 gain screen. If you're going big with that PJ go for the higher gain. I get a very good picture for not being optimal conditions. Oh and that's in eco-mode too.

How far from the screen is your PJ mounted?
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post #13 of 13 Old 09-29-2011, 08:47 AM
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As close as I possibly could. Around 14.5' away to get a 136" scope image.


The above post is 100% medically accurate


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