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mr_ro_co
Joined: 08 May 2006 Posts: 1643 Location: Santa Fe NM
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| Posted: Sat May 25, 2013 5:42 pm Post subject: |
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| kal wrote: | Everyone has has seen both my projectors in action preferred the digital.
Kal |
It is for this reason that I do not want to see this projector in action.
Steve
_________________ Not only is there no god, try finding a plumber on Sunday!
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dvh99
Joined: 25 Dec 2009 Posts: 2158 Location: nederland
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| Posted: Sun May 26, 2013 4:57 pm Post subject: |
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blended 9inch with mods vs a 8 inch without mods wouldn`t be a fair comparison either, i bet your setup smokes kal`s.
_________________ 1 answer always poses multiple questions.
marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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Spanky Ham
Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central
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| Posted: Mon May 27, 2013 8:42 pm Post subject: |
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A blend 9" will be better than an 8", but it still isn't going to have a high mtf. I a not sure if you can do complete fade to black like Kal is saying. In this instance, Kal is a sample of 1. IIRC Darinp measured a gamma modded G70 at over 100k to 1 on/off. I believe this was four years ago, so I am not sure what calibration instruments.
I might add that a lot of this theoretical discussions took place on AVS years ago. Darin usually played the digital devil in these arguments. His point that he explained in his article on Secrets is that all of these metrics play a part in making a good picture. If ANSI cr didn't matter, then there would never have been a need for LC. The bottom line is that everyone individually decides which metric is more important and how much weight to attribute to each metric.
If one reads some of those old battle threads, then you will see that one of Darin's chief adversaries was Dave (person99). Dave would argue constantly with Darin until he switched to digital. Dave, who was big on on/off cr, ironically went with a DLP. IIRC he put a Panamorph lens or similar on it to go scope. He found that he preferred this set up to his CRT.
Which brings us to my final point and may be the biggest difference between a lot of people here. For Dave, Crabb, Kal, some others and myself, the technology is a means to an end not the end itself. We are looking for a beautiful big picture experience and will go with whatever achieves that for us. For others like Nash, CRT is a hobby and the means to that end. There is no right or wrong just a preference.
Finally, I see JVC has a RS45 for $1900 on ebay. I am probably going to run my G90 till it dies and then I wouldn't hesitate to click the BIN button.
http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&pub=5574906687&toolid=10001&campid=5336656890&customid=&mpre=http%3A%2F%2Fwww.ebay.com%2Fitm%2FJVC-D-ILA-DLA-RS45U-DLA-RS45-REFERENCE-SERIES-3D-HOME-CINEMA-PROJECTOR-%2F140982610835%3Fpt%3DUS_Video_Projectors%26hash%3Ditem20d337eb93
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kal Forum Administrator
Joined: 06 Mar 2006 Posts: 18114 Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Spanky Ham
Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central
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| Posted: Mon May 27, 2013 10:19 pm Post subject: |
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One nice thing about buying these pjs is that they say that it has been refurb by their techs. My guess is that you don't have to worry about it having a convergence issue. I know my best friend received a bad JVC. His was replaced and I assume these refurbs are the ones like his that had problems. I wonder if our JVC guy could give some insight on this.
Oh I should add this for you Kal. They had a 55 for $3900 a couple of days ago.
One more edit. They have the RS40 for $1549.
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kal Forum Administrator
Joined: 06 Mar 2006 Posts: 18114 Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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ecrabb Forum Moderator
Joined: 13 Mar 2006 Posts: 15909 Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue May 28, 2013 2:40 pm Post subject: |
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| Spanky Ham wrote: | | Finally, I see JVC has a RS45 for $1900 on ebay. |
It doesn't include sales tax, but even with the sales tax, that's a great price for a machine like that. I paid $2200 for mine just about a year ago. The weird thing is that they have an RS40 for $100 more... And that's a special $100 off Memorial Day sale. Weird.
Also makes me feel good that I'm only in the hole a couple hundy since a year ago. I looked the other day and I've got like 500 hours on the lamp, so I'm getting my money's worth apparently.
SC
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km987654
Joined: 25 Jul 2007 Posts: 2874 Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue May 28, 2013 10:25 pm Post subject: |
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| Curt Palme wrote: | Seriously you guys, even I have bailed out of these discussions years ago.. and it's completely in my best interest to be biased.  |
You have to say though that this is the best digital v CRT thread. Unlikely to be the last.
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stridsvognen Guest
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| Posted: Tue May 28, 2013 10:52 pm Post subject: |
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Fun thread.. would be interesting if someone would make some real world ansi contrast Measurements on CRT and digital.. Im not convinced that digital have better Ansi..
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ecrabb Forum Moderator
Joined: 13 Mar 2006 Posts: 15909 Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Wed May 29, 2013 12:06 am Post subject: |
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| stridsvognen wrote: | | Fun thread.. would be interesting if someone would make some real world ansi contrast Measurements on CRT and digital.. Im not convinced that digital have better Ansi.. |
Come on, you're kidding, right? That ship sailed years ago, and it was covered time and time again over at AVS as William Phelps and others were replacing customers' CRTs with digital. CRT has terrible ANSI.
http://www.chromapure.com/colorscience-contrast.asp
| Quote: | | DLPs provide the excellent ANSI contrast figures in the 400-800:1 range (front projectors are better than rear projectors). Oddly, CRTs, which perform so well with on/off contrast, offer poor ANSI contrast figures of 75-150:1. |
Even low-end digitals are better, while good digitals easily produce 3-, 4-, or even 5 times the ANSI contrast. Even our JVCs, which are pretty abysmal compared to good DLP, at up around 400:1 are still much, much better than CRT.
This is a long-time, well-understood phenomena. CRT lenses are huge, slow, wide-angle lenses, and the phosphor is a giant white sheet of material that lights up when scattered light hits it. It's a terrible setup where ANSI contrast is concerned. CRT with its high on/off contrast excels at low-APL scenes; digital with its high ANSI excels at high-APL scenes.
Regardless, as has already been discussed in this thread, it isn't just on/off, or just ANSI, but a combination of on/off, ansi, MTF and even some more difficult-to-define factors that make for a high-quality image.
SC
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stridsvognen Guest
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| Posted: Wed May 29, 2013 12:23 am Post subject: |
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The interesting thing would be your measurements.. Not the fancy nr from the catalogs.. Many DLP have problem douing a 1000:1 on off contrast.
What is the Ansi contrast on your JVC.? and please not the nr. in the color catalog where you ordered yours.
My 8500 AC Ultra do 38:1 in a room with White walls, and some light from the street.. Im not sure i remember the nr right on my JVC, so have to check up on that another day.
it was measured with 12fl, and the ansi pattern in the radiance.
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km987654
Joined: 25 Jul 2007 Posts: 2874 Location: Australia
TV/Projector: Barco BG809s
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| Posted: Wed May 29, 2013 12:50 am Post subject: |
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There are so many knowledgeable people here that have a wonderful grasp of all the technical aspects of image projection.
I would say though if you have to use finely tuned instruments to detect a difference in image "quality" then I am not sure why anyone actually bothers if you can't simply look at what is being projected and either like it or not then what are you doing. I put it to everyone here that it would be possible to obtain a technically superior image, one that has all the right technical features, and I bet some will look at it and not like it.
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opv
Joined: 18 May 2010 Posts: 202 Location: Emek Hefer,Israel
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| Posted: Wed May 29, 2013 6:40 am Post subject: |
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| ecrabb wrote: |
This is a long-time, well-understood phenomena. CRT lenses are huge, slow, wide-angle lenses, and the phosphor is a giant white sheet of material that lights up when scattered light hits it. It's a terrible setup where ANSI contrast is concerned. CRT with its high on/off contrast excels at low-APL scenes; digital with its high ANSI excels at high-APL scenes.
SC |
Does anyone have the ansi CR numbers for direct view CRT displays?
They have no lens, theoretically, the ansi CR should be higher than CRT projectors.
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ecrabb Forum Moderator
Joined: 13 Mar 2006 Posts: 15909 Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Wed May 29, 2013 7:10 am Post subject: |
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| opv wrote: | Does anyone have the ansi CR numbers for direct view CRT displays?
They have no lens, theoretically, the ansi CR should be higher than CRT projectors. |
I don't have the numbers, but yes - they were much higher than with a projection tube/lens.
SC
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opv
Joined: 18 May 2010 Posts: 202 Location: Emek Hefer,Israel
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| Posted: Wed May 29, 2013 7:22 am Post subject: |
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| ecrabb wrote: | | opv wrote: | Does anyone have the ansi CR numbers for direct view CRT displays?
They have no lens, theoretically, the ansi CR should be higher than CRT projectors. |
I don't have the numbers, but yes - they were much higher than with a projection tube/lens.
SC |
Is much higher close to plasma displays or close to DLP projectors?
I'm trying to understand if the low ansi CR on CRT is caused by the large lens or the phosphor itself.
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stridsvognen Guest
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| Posted: Wed May 29, 2013 8:04 am Post subject: |
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| opv wrote: | | ecrabb wrote: | | opv wrote: | Does anyone have the ansi CR numbers for direct view CRT displays?
They have no lens, theoretically, the ansi CR should be higher than CRT projectors. |
I don't have the numbers, but yes - they were much higher than with a projection tube/lens.
SC |
Is much higher close to plasma displays or close to DLP projectors?
I'm trying to understand if the low ansi CR on CRT is caused by the large lens or the phosphor itself. |
I think we should stick with ansi nr from our own setups, and forget about the beaten up specs.
Im sure lots of Guys here have both digital and CRT on the same screen and can measure both under same conditions.
Ill post some nr on DLP. D-ILA, and CRT both 8" AC and 9" LC.
I think the unused phosphor on our CRT projectors when running 16.9 on 4:3 tubes are hurting the ANSI nr. some, but its a cheep fix.
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opv
Joined: 18 May 2010 Posts: 202 Location: Emek Hefer,Israel
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| Posted: Wed May 29, 2013 8:11 am Post subject: |
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| stridsvognen wrote: | | opv wrote: | | ecrabb wrote: | | opv wrote: | Does anyone have the ansi CR numbers for direct view CRT displays?
They have no lens, theoretically, the ansi CR should be higher than CRT projectors. |
I don't have the numbers, but yes - they were much higher than with a projection tube/lens.
SC |
Is much higher close to plasma displays or close to DLP projectors?
I'm trying to understand if the low ansi CR on CRT is caused by the large lens or the phosphor itself. |
I think we should stick with ansi nr from our own setups, and forget about the beaten up specs.
I'm sure lots of Guys here have both digital and CRT on the same screen and can measure both under same conditions.
Ill post some nr on DLP. D-ILA, and CRT both 8" AC and 9" LC.
I think the unused phosphor on our CRT projectors when running 16.9 on 4:3 tubes are hurting the ANSI nr. some, but its a cheep fix. |
Why?
Most of the setups have ansi CR limit due to the room conditions.
I want to understand the limits measured in optimal conditions.
I'm not talking about the ridicules figures from the spec, but measured numbers taken in a bat cave.
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stridsvognen Guest
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| Posted: Wed May 29, 2013 8:30 am Post subject: |
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I think you need to find the displays, and measure them yourself then. So your sure you get the right nr. and same conditions.
And take them apart and check out the internal conditions.
If you think about the displays a bit like a room, then you have different conditions/ light reflections, in projectors its the chamber where the chips/ panels are, and how much ligt is trown back on the panel, can also be reflecting light from the screen gettin back true the lense.
On CRT tube i guess there is some light inside the tube messing with what you see on the tube face.
Its also possible just to hear what others think, and see if that helps you to understand how its working. remember we all prefer and have different ways of looking at it. Thats the biggest problem on a forum.. WHO knows for sure what the guy writing is talking about, or how is his standards compared to yours.
You can find one that know all the details from reading the last 20 years, and have the power to controle the Words he write.
Then there might be another guy WHO have 40 years of real life experience with almost all displays ever made, but he is no good writing about it.. Wich one will you belive.. I know..
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opv
Joined: 18 May 2010 Posts: 202 Location: Emek Hefer,Israel
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| Posted: Wed May 29, 2013 8:41 am Post subject: |
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Don't get me wrong, but what exactly made you think I'm looking for an advice?
I love my 9" CRT PQ and I know the upsides and downsides.
I'm interested in a theoretic discussion.
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stridsvognen Guest
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| Posted: Wed May 29, 2013 8:55 am Post subject: |
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| opv wrote: | Don't get me wrong, but what exactly made you think I'm looking for an advice?
I love my 9" CRT PQ and I know the upsides and downsides.
I'm interested in a theoretic discussion. |
Ohh sorry to disturb you. My mistake.!!
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