Official JVC DILA-X500R / RS49U / RS4910U Owners Thread - Page 79 - AVS Forum
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post #2341 of 3020 Old 09-21-2014, 03:27 PM
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[quote=cardoski;27603089]
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Originally Posted by AV Science Sales 5 View Post
What gain screen?[/QUOTE

Well I really like my unity screen so likely another unity, maybe a little gain. The walls and cieling will be completely velvet. Chances are i will be upgrading the JVC in the next 2 years with something brighter, but in case I want to have enough juice to light up a screen 150in. I am pretty sceptical it can, as my 115in screen is not overly bright.

I don't think the projector has enough brightness to light up a 150" diagonal scope unity gain screen. Some may think it is bright enough, but I don't.

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post #2342 of 3020 Old 09-21-2014, 03:39 PM
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Mike, it's a good thing you added that last part, otherwise you'd get the 2 or 3 people running a 150"+ wide screen coming in to tell people "it's definitely bright enough". But image brightness is very subjective and what is acceptable changes from person to person. I think it's important to make safe recommendations that apply to most people and that's exactly what you and most others do on this site. Some want to push the limits and tell people it's perfectly fine to run this, and other lower lumen output, projectors at absurdly large screen sizes when few would find the image bright enough.

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post #2343 of 3020 Old 09-21-2014, 03:53 PM
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[quote=AV Science Sales 5;27603393]
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Originally Posted by cardoski View Post


I don't think the projector has enough brightness to light up a 150" diagonal scope unity gain screen. Some may think it is bright enough, but I don't.

That is what I thought, guess I will have to buy another X500 to put it in a stack . As I said, even in my current dark pit, my 115 unity screen is not overly bright. It is a little frustrating that the JVC can not go brighter, everything else about the image is excellent.

James Reid:D
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post #2344 of 3020 Old 09-21-2014, 06:59 PM
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Originally Posted by Jnelson Young View Post
The JVC remote works for me whether or not I am running iRule; JVC app, otoh, does not work when iRule is running.

For clarity, my JVC remote also works with iRule running or not. Its just when "lens control" is pressed the green grid appears then disappears. Its as if the PJREQ command that the JVC receives ever 4 secs from iRule cancels the lens control session, when iRule is not running the green grid stays on screen and I can zoom, focus or shift the image.
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post #2345 of 3020 Old 09-21-2014, 08:55 PM
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Ok i am in a dilemma, I wil be shooting a 138" diagonal 2.35 scope screen. I also like the unity gain screen for the uniformity. If I go for a studiotek 1.3, besides gaining brightness, what will I lose out going for a higher gain screen like 1.3
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post #2346 of 3020 Old 09-21-2014, 09:10 PM
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Stewart, among others, use an optical coating to get a higher gain from the screen. They use "sparkle" elements to help directionalize light to get a higher gain. In turn, on brighter scenes, these sparkle elements can be seen easily. By going with almost all higher than 1.0 gain screens you're looking at adding visual artifacts to the presentation. Some people are fine with that detriment for the added gain and others can't stand the artifacts created. I would get screen samples if you aren't aware of what I'm talking about. Sometimes the samples aren't really enough to give you perspective on whether or not the artifacts will annoy you enough to consider a unity gain or lower gain screen. So YMMV with the screen samples.

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post #2347 of 3020 Old 09-22-2014, 10:40 AM
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Quote:
Originally Posted by Seegs108 View Post
Mike, it's a good thing you added that last part, otherwise you'd get the 2 or 3 people running a 150"+ wide screen coming in to tell people "it's definitely bright enough". But image brightness is very subjective and what is acceptable changes from person to person. I think it's important to make safe recommendations that apply to most people and that's exactly what you and most others do on this site. Some want to push the limits and tell people it's perfectly fine to run this, and other lower lumen output, projectors at absurdly large screen sizes when few would find the image bright enough.
I agree Seegs. I think I would get myself into more trouble telling people that the projector would easily light up a 150" screen. For some it would be bright enough, but I think for the majority of people it would not be.

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post #2348 of 3020 Old 09-23-2014, 08:13 AM
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Quote:
Originally Posted by AV Science Sales 5 View Post
I agree Seegs. I think I would get myself into more trouble telling people that the projector would easily light up a 150" screen. For some it would be bright enough, but I think for the majority of people it would not be.
Just so I understand, 150" diag = 12' x 5' scope screen = 60 sqft. 1200 calibrated lumens on a unity gain screen = 20 ftL with a new bulb, and perhaps as low as 10ftL when the bulb has fully aged.

You are saying that is insufficient brightness? Just curious what you use as a rule of thumb then?

Thanks
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post #2349 of 3020 Old 09-23-2014, 09:56 AM
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Originally Posted by kromkamp View Post
Just so I understand, 150" diag = 12' x 5' scope screen = 60 sqft. 1200 calibrated lumens on a unity gain screen = 20 ftL with a new bulb, and perhaps as low as 10ftL when the bulb has fully aged.

You are saying that is insufficient brightness? Just curious what you use as a rule of thumb then?

Thanks
I think there are so many variables it's really tough to quantify. Room color, ambient light, screen gain, lens or no lens, throw distance, etc all play a contributing factor to overall brightness.

Brightness is also very subjective. What is bright to me might not be to someone else.

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post #2350 of 3020 Old 09-23-2014, 10:01 AM
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Quote:
Originally Posted by kromkamp View Post
Just so I understand, 150" diag = 12' x 5' scope screen = 60 sqft. 1200 calibrated lumens on a unity gain screen = 20 ftL with a new bulb, and perhaps as low as 10ftL when the bulb has fully aged.

You are saying that is insufficient brightness? Just curious what you use as a rule of thumb then?

Thanks

I am measuring 13ftl with my X500 at 16ft throw and a 115in unity screen in a velvet covered room. Not sure how anyone is getting 20ftl calibrated.

James Reid:D
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post #2351 of 3020 Old 09-23-2014, 10:06 AM
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Originally Posted by cardoski View Post
I am measuring 13ftl with my X500 at 16ft throw and a 115in unity screen in a velvet covered room. Not sure how anyone is getting 20ftl calibrated.
That's pretty close too. Imagine us guys shooting from 20+ ft. Lumens start disappearing in a hurry.

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post #2352 of 3020 Old 09-23-2014, 10:12 AM
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That's pretty close too. Imagine us guys shooting from 20+ ft. Lumens start disappearing in a hurry.

I wouldn't say the image is dull and overall it is spectacular, but it is not a bright projector and I can see it struggling on a 150in unity screen. I have heard the claim of 1200 lumens calibrated before, but my machine isn't putting that out.

James Reid:D
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post #2353 of 3020 Old 09-23-2014, 11:26 AM
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Quote:
Originally Posted by kromkamp View Post
Just so I understand, 150" diag = 12' x 5' scope screen = 60 sqft. 1200 calibrated lumens on a unity gain screen = 20 ftL with a new bulb, and perhaps as low as 10ftL when the bulb has fully aged.

You are saying that is insufficient brightness? Just curious what you use as a rule of thumb then?

Thanks
You have to take the sqft of the 16:9 at 150in, which will by 68sqft. It will be 74in by 132in. Also, the 49 will not be as much as 1200 lumens on a 150in screen. Maybe 1000 lumens at max. At most, it will be 14ftL, or on an average it will be 900 lumens at 13ftL. However, this is with a screen with a 1.0 gain
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post #2354 of 3020 Old 09-23-2014, 07:19 PM
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I am installing my 4910 tomorrow- UPS willing- from Mike at AVS. Very excited! I have a Bat cave with a 170" 2.35:1 screen at 18'5" with my RS45. The RS45 is bright enough, but I understand brightness is a personal judgment. The screen is a 1.4 gain Carada BW screen, but most testing shows it as 1.2-1.3 gain.

Does anyone have some initial settings they'd recommend to me? Are many people using Natural out of the box to get started as several reviews suggested? Any people using their 4910 with the Carada BW screen? Any thoughts appreciated!
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post #2355 of 3020 Old 09-23-2014, 09:20 PM
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Quote:
Originally Posted by kromkamp View Post
Just so I understand, 150" diag = 12' x 5' scope screen = 60 sqft. 1200 calibrated lumens on a unity gain screen = 20 ftL with a new bulb, and perhaps as low as 10ftL when the bulb has fully aged.

You are saying that is insufficient brightness? Just curious what you use as a rule of thumb then?

Thanks
You can't use the scope screen size. The projector only projects a 16:9 image, so you have to use that size, based on the 12' width. So screen size is 6.74 x 12=80.90SF. 1,200 lumens is too high. Only one review got that many lumens. Besides, that is with new lamp and lamp will dim. I use 1,000 lumens (new lamp) 1,000/80.9=12.36FL. Not enough lumens for a unity gain screen.

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post #2356 of 3020 Old 09-23-2014, 09:25 PM
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Originally Posted by blee0120 View Post
You have to take the sqft of the 16:9 at 150in, which will by 68sqft. It will be 74in by 132in. Also, the 49 will not be as much as 1200 lumens on a 150in screen. Maybe 1000 lumens at max. At most, it will be 14ftL, or on an average it will be 900 lumens at 13ftL. However, this is with a screen with a 1.0 gain
You used 150" 16:9 and he was talking 150" scope. Then he said 12' wide scope (156" diagonal 2.35), so I ran the numbers for a 12' wide 2.35 scope screen.

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post #2357 of 3020 Old 09-23-2014, 09:30 PM
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Originally Posted by chasiliff View Post
I am installing my 4910 tomorrow- UPS willing- from Mike at AVS. Very excited! I have a Bat cave with a 170" 2.35:1 screen at 18'5" with my RS45. The RS45 is bright enough, but I understand brightness is a personal judgment. The screen is a 1.4 gain Carada BW screen, but most testing shows it as 1.2-1.3 gain.

Does anyone have some initial settings they'd recommend to me? Are many people using Natural out of the box to get started as several reviews suggested? Any people using their 4910 with the Carada BW screen? Any thoughts appreciated!
Sent you an email.

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post #2358 of 3020 Old 09-24-2014, 07:33 AM
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I am measuring 13ftl with my X500 at 16ft throw and a 115in unity screen in a velvet covered room. Not sure how anyone is getting 20ftl calibrated.
How open is your IRIS?
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post #2359 of 3020 Old 09-24-2014, 07:52 AM
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How open is your IRIS?
Most likely not, a 120in 1.0 gain screen needs less than 900 lumens to get 20ftL. I think my sweet spot is 16ftL, which is doable in low lamp on my 120in screen.
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Most likely not, a 120in 1.0 gain screen needs less than 900 lumens to get 20ftL. I think my sweet spot is 16ftL, which is doable in low lamp on my 120in screen.
Guess that explains why JVC didn't make an issue of sending me a new lamp when mine went from getting 14 FtL IRIS at -7 calibrated on a 100" 1.1 gain screen with a 13Ft throw to only 12FtL calibrated with the IRIS at 0 with 100 hours.

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Guess that explains why JVC didn't make an issue of sending me a new lamp when mine went from getting 14 FtL IRIS at -7 calibrated on a 100" 1.1 gain screen with a 12Ft throw to only 12FtL calibrated with the IRIS at 0 with 100 hours.
There was clearly something wrong. A 100in diagonally? That will be 350 lumens on a 1.1 gain screen.
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post #2362 of 3020 Old 09-24-2014, 08:04 AM
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There was clearly something wrong. A 100in diagonally? That will be 350 lumens on a 1.1 gain screen.

Yes 100" diag. Like I said, no questions asked on that issue. New lamp arrives today. I do suspect the screen is really 1.0.....but still
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How open is your IRIS?

My iris was at -3 when I calibrated in high lamp. I wonder if maybe my meter has become inaccurate?

James Reid:D
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Originally Posted by blee0120 View Post
Most likely not, a 120in 1.0 gain screen needs less than 900 lumens to get 20ftL. I think my sweet spot is 16ftL, which is doable in low lamp on my 120in screen.

What is your throw distance?

James Reid:D
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post #2365 of 3020 Old 09-24-2014, 11:25 AM
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My iris was at -3 when I calibrated in high lamp. I wonder if maybe my meter has become inaccurate?
I didn't realize you were in high lamp. I was using ow lamp mode.
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What is your throw distance?
13Ft about
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post #2367 of 3020 Old 09-24-2014, 11:28 AM
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Most likely not, a 120in 1.0 gain screen needs less than 900 lumens to get 20ftL. I think my sweet spot is 16ftL, which is doable in low lamp on my 120in screen.
So you are getting 16FtL calibrated in low lamp on a 120in 1.0 gain screen?

IRIS set at? how many hours?
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post #2368 of 3020 Old 09-24-2014, 11:32 AM
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Originally Posted by tanwn1 View Post
Ok i am in a dilemma, I wil be shooting a 138" diagonal 2.35 scope screen. I also like the unity gain screen for the uniformity. If I go for a studiotek 1.3, besides gaining brightness, what will I lose out going for a higher gain screen like 1.3

IMO you lose nothing - my StudioTek 130 is very uniform. I love the picture on it. If you need a screen with some gain, it's pretty much the " go to " gold standard.

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Originally Posted by cardoski View Post
I wouldn't say the image is dull and overall it is spectacular, but it is not a bright projector and I can see it struggling on a 150in unity screen. I have heard the claim of 1200 lumens calibrated before, but my machine isn't putting that out.

I think I measured more like 950 lumens or so on the one I had.

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When I get some time I am going to recalibrate and see what is going on as far as ftl. I am thinking of buying a new meter, but I am building a new theatre(will take forever) so money is tight. Maybe someone can recommend an inexpensive light meter so I can compare light output to my i1display meter.

James Reid:D
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