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GREG1292
Joined: 10 Oct 2006
Posts: 417
Location: indiana
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| Posted: Tue Aug 25, 2009 5:04 pm Post subject: Screen for Zenith 1200X |
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I have a question about a screen I was looking at for my crt projector. Trying to increase my foot lumens without cranking up the controls on the projector
Da-lite hipower 2.8 gain screen with my crt's in the middle(right above my head) of the screen doing a 12ft screen. The Zenith has contrast modulation which should control any hotspotting. 
Has anyone used this screen and if so what did you think? There will be no off axis viewing.
Thanks greg
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CRT_Ben
Joined: 28 Aug 2006
Posts: 1684
Location: Northern Virginia
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| Posted: Tue Aug 25, 2009 5:15 pm Post subject: |
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Hotspotting cannot be dialed out with contrast modulation. Color shift can, but only from one viewing location, as in one seat only.
I used the HP for about 18 months in a floor setup and now my dad has it in a ceiling mount setup (the PJ is pretty low). It still has good pop in a ceiling mount setup as long as the PJ isn't too high above the seats, but color uniformity definitely suffers over a good unity (or near unity) gain screen, and color shifting is very evident moving from one side to the other of a three seat row. I didn't find hotspotting to be much of an issue with the HP.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Aug 25, 2009 5:17 pm Post subject: |
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I've seen the HP twice locally with marquee's at friends HT's. It's a really good choice and I didn't notice any hot-spotting, at least nothing that would call attention to itself. Plus contrast modualtion wouldn't affect hot-spotting anyway, maybe color shift which isn't really an issue with HP either.
I use draper M1300 and it's a very bright fabric as well. stay away from high gain 2.5
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GREG1292
Joined: 10 Oct 2006
Posts: 417
Location: indiana
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Aug 25, 2009 6:41 pm Post subject: |
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| GREG1292 wrote: | Thanks for the replies!
What do you mean stay away from 2.5 gain screen? The Hi-power is 2.8 gain! greg |
they are 2 totally different materials. 2.5 high gain , also called glass beaded, sucks ass for CRT because it's color-shifts like crazy. Hi-power 2.8 is a completely different technology. Be sure you don't mix them up.
I use a litte contrast modualtion with my marquee simply to make the center of screen a little lesss bright and the corners a little more. Without CM the center of the screen is always a lot brighter. By bumping the tube's output at the fringes you can get it almsot perfect. Don't go crazy here, your overcoming a problem with the optics and running the Phosphor harder on the outside of tube face to do it. +/-10% max is all I would suggest
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CRT_Ben
Joined: 28 Aug 2006
Posts: 1684
Location: Northern Virginia
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| Posted: Tue Aug 25, 2009 6:50 pm Post subject: |
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| GREG1292 wrote: | Thanks for the replies!
What do you mean stay away from 2.5 gain screen? The Hi-power is 2.8 gain!
I am gald to here the da_lite screen dosen't have color shift and thanks for clearing up contrast modulation. I
alway's get confused.
greg |
I know that Dragan and some others see it as a non-issue - but the HP does color shift, and it was enough to bother me. If you're coming from a low gain screen and color uniformity is important to you, get a free sample from Da-lite and try it out. Tape it up in the center of your current screen and move from the center of your viewing area to one edge, then to the other edge. In my experience, from one end of my couch to the other, there was a significant shift in color temperature. If I get a chance, I'll take pictures of the color shift on my dad's screen and measure it in Photoshop.
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GREG1292
Joined: 10 Oct 2006
Posts: 417
Location: indiana
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| Posted: Tue Aug 25, 2009 7:17 pm Post subject: |
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| draganm wrote: | | GREG1292 wrote: | Thanks for the replies!
What do you mean stay away from 2.5 gain screen? The Hi-power is 2.8 gain! greg |
they are 2 totally different materials. 2.5 high gain , also called glass beaded, sucks ass for CRT because it's color-shifts like crazy. Hi-power 2.8 is a completely different technology. Be sure you don't mix them up.
I use a litte contrast modualtion with my marquee simply to make the center of screen a little lesss bright and the corners a little more. Without CM the center of the screen is always a lot brighter. By bumping the tube's output at the fringes you can get it almsot perfect. Don't go crazy here, your overcoming a problem with the optics and running the Phosphor harder on the outside of tube face to do it. +/-10% max is all I would suggest |
I now understand what you ment and agree 100% The Da-lite rep assured me with the crt's 4 1/2 feet off the ground and the projector being in the center of the screen and with me sitting 1 foot under that I would be ok. I also thought with CM I could control the uniformity to some degree.
Ben It would be great to see some pics if you have the time! I will post a pic of my projector setup and room.
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Tue Aug 25, 2009 7:19 pm Post subject: |
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You will see hotspotting. It will also introduce some blue red shift at different points of the screen. I had one of these PJs, due to how close they sit to the screen, they will colorshift and hotspot (angle of light greater) than many other PJs.
I would personally stay away from any screen above a 1.3 gain with this PJ, as I even saw issues on one of those (but not with a studiotek 130).
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A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
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GREG1292
Joined: 10 Oct 2006
Posts: 417
Location: indiana
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| Posted: Tue Aug 25, 2009 8:20 pm Post subject: |
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Well sh*t just ordered 159" screen model C for 375.00. I guess it to late to turn back now  Guess the worst case will be I will dump it quick and recoup my cost. I will post screenshots on Monday once I setup the screen. I am curious
because I will have the crts in the center of the screen how much shifty there will be! I will be honest in the evaluation and I can understand floor or ceiling mount applications why that would be but hey I am bored and want to learn from
the school of hard knocks!
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CRT_Ben
Joined: 28 Aug 2006
Posts: 1684
Location: Northern Virginia
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| Posted: Tue Aug 25, 2009 9:07 pm Post subject: |
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| GREG1292 wrote: | Well sh*t just ordered 159" screen model C for 375.00. I guess it to late to turn back now Guess the worst case will be I will dump it quick and recoup my cost. I will post screenshots on Monday once I setup the screen. I am curious
because I will have the crts in the center of the screen how much shifty there will be! I will be honest in the evaluation and I can understand floor or ceiling mount applications why that would be but hey I am bored and want to learn from
the school of hard knocks! |
You keep saying that you'll have the guns in the center of the screen - do you mean horizontally, or vertically? Every CRT setup should have them dead center horizontally, but very few have them centered vertically. Either way, color shift will still be there, and it only occurs in the horizontal plane, where the CRT's are vertically will only have an effect on overall brightness.
You seem a bit confused by color shift and I think maybe the missing link here is that color shift is dynamic, not static. It will get worse as you get farther from the center of the screen, this is why CM is of very limited usefulness to dial it out - you could choose a single seat and you could make it better for that seat but not the others.
I apologize if the wording above seems harsh - I really don't mean it to be, just trying to help 
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betel
Joined: 20 Apr 2006
Posts: 448
Location: Maryville, Tennessee (Just South of Knoxville)
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| Posted: Tue Aug 25, 2009 10:04 pm Post subject: |
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Greg, What's up with your Videogon ad? There one day, then gone, now back again.
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nuttall_chris
Joined: 08 Mar 2006
Posts: 832
Location: Ottawa, Ontario, Canada
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| Posted: Tue Aug 25, 2009 10:09 pm Post subject: |
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I used a High Power Screen with my Marquee and it had horrible colour shift. Very red to one side and very blue to the other. On the plus side there was virtually no hot spotting and it was very bright.
The High Power was not good at all for CRT but it's amazing on my JVC RS2
Chris.
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GREG1292
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Location: indiana
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WTS
Joined: 08 Mar 2006
Posts: 1276
Location: Calgary
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| Posted: Wed Aug 26, 2009 1:27 pm Post subject: |
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I have a 1200x and I use a Hurley 1.5 gain screen and I think it's great. I use the CM to tweak the colour shitfting.
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Thanks
Walter
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GREG1292
Joined: 10 Oct 2006
Posts: 417
Location: indiana
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| Posted: Wed Aug 26, 2009 1:58 pm Post subject: |
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| WTS wrote: | | I have a 1200x and I use a Hurley 1.5 gain screen and I think it's great. I use the CM to tweak the colour shitfting. |
That is great to here and I have hope again 
My da-lite rep talked to Ken Whitcomb and seems to think I will have no problems. I think videospectra is 1.5 but the projector needs to be ceiling mounted. The highpower needs the lens in the center of the screen.He said when your walking around I would of course but sitting right in front which I have no off axis seats I should be fine!
WTS where do you have your CM set at to adjust for the color shift? I now run contrast,brightness,gain,and cutoff all at 50 or under.I am running 1080i 96khz also what rez do you run your zenith at?
Thanks
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CRT_Ben
Joined: 28 Aug 2006
Posts: 1684
Location: Northern Virginia
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| Posted: Wed Aug 26, 2009 4:17 pm Post subject: |
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If you're willing to accept some color shifting I don't think you'll be disappointed, Greg. I think based on the range of opinions on the HP in this thread, some people place more emphasis on color uniformity than others. However in the future I would ask these questions and get samples before ordering, so you know you're making the right decision 
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Aug 26, 2009 4:24 pm Post subject: |
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| GREG1292 wrote: | | My da-lite rep talked to Ken Whitcomb and seems to think I will have no problems. I think videospectra is 1.5 but the projector needs to be ceiling mounted. The highpower needs the lens in the center of the screen.He said when your walking around I would of course but sitting right in front which I have no off axis seats I should be fine! |
dude your going to love it, it's a great screen. Even if your sitting off to one side of the room and the picture appears a little warmer or cooler depending on which side it's always uniform across the whole screen.
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GREG1292
Joined: 10 Oct 2006
Posts: 417
Location: indiana
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| Posted: Wed Aug 26, 2009 5:51 pm Post subject: |
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| draganm wrote: | | GREG1292 wrote: | | My da-lite rep talked to Ken Whitcomb and seems to think I will have no problems. I think videospectra is 1.5 but the projector needs to be ceiling mounted. The highpower needs the lens in the center of the screen.He said when your walking around I would of course but sitting right in front which I have no off axis seats I should be fine! |
dude your going to love it, it's a great screen. Even if your sitting off to one side of the room and the picture appears a little warmer or cooler depending on which side it's always uniform across the whole screen. |
Cool  I never thought of it that way. So if the movie is to warm for my taste I sit on the blue side. My 12 foot couch is in front of my 12ft screen that is 12ft back so that is as far off axis as I will be. I hope I am plasmatized.
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Wed Aug 26, 2009 5:58 pm Post subject: |
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I'm a little divided on the HP material, I have a 96" wide Model C, the screen material has excellent image quality but it is impossible to clean. I have a few spots on my screen from insect damage and other little accidents. It is impossible to clean any of those spots off, and if you attempt to clean you'll likely only make it worse. It would be my choice of screen if I had a very clean room and never had to worry about dirt, dust, or bugs. But in my room I'm still wondering if something like the Wilsonart DW would have been a better, more durable choice.
But overall I'm happy with it, and I think you will be too; as long as you can keep it clean.
Erik
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Wed Aug 26, 2009 6:00 pm Post subject: |
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Looking at your picture I think it will work fine, you may want to put the couch on a riser though. My G70 only sits about 6" overhead, and the closer you get, the better the POP on screen. The brightness is addictive...
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