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JVC RS4500 (native 4K laser projector)

Re: JVC RS4500 (native 4K laser projector)
« Reply #555 on: February 23, 2017, 12:32:40 PM »
That is also one of the reasons, I am going to switch to V6 fabric. V6 has a little higher gain.

What fabric do you currently have?

AVSCraig

Re: JVC RS4500 (native 4K laser projector)
« Reply #556 on: February 23, 2017, 12:44:45 PM »
@AVSCraig,  I have actually been emailing Chris about my unit and your unit.  My unit measured out almost identical to your original findings, of just shy of 2300 lumens / max Laser / iris open in natural mode.

So what was done different, so now you have 2800 lumens? What mode was that measured in?  The 500 lumen difference is a huge deal to me. 

Also, I have looked at that Accucal screen report and some of those numbers don't make any sense. They show the EN4K material at 0.84, but when I shoot my fabric with a Minolta LS100 and then compare it to a sample of Studiotec 100, which is a Refernce 1.0 gain, that gives my EN4K fabric a gain of 0.7. This is also exactly what sound and vision measured when they reviewed the EN4K screen as well.

Thanks
Chris

High Bright yielded 2800 lumens. We switched on HDTV ( Dish ) and for something like the Super Bowl, it looked fine. Obviously you wouldn't use that for watching a movie, but it would be plenty fine for the NBA playoffs with all the lights on. And trust me, Chris said " turn some lights on - this is hurting my eyes " - it was blazing bright !

Don't know what to tell you about the screen report. Jeff has ST 100 samples, and ST 130 G3 samples, and I gave him the Cima Neve samples myself. But even at 1.1 gain, I get over 70 foot lamberts !  ;D

Re: JVC RS4500 (native 4K laser projector)
« Reply #557 on: February 23, 2017, 01:08:56 PM »
High Bright yielded 2800 lumens. We switched on HDTV ( Dish ) and for something like the Super Bowl, it looked fine. Obviously you wouldn't use that for watching a movie, but it would be plenty fine for the NBA playoffs with all the lights on. And trust me, Chris said " turn some lights on - this is hurting my eyes " - it was blazing bright !

Don't know what to tell you about the screen report. Jeff has ST 100 samples, and ST 130 G3 samples, and I gave him the Cima Neve samples myself. But even at 1.1 gain, I get over 70 foot lamberts !  ;D

Ok this makes more sense now. I just shot mine with the Minolta LS100, and in High Brightness mode I get right at or just over 3000 lumens. The downside is the image is super green, but it would be usable I guess for certain events if extra brightness was needed.

What I want to know is if these units should be calibrated from "High Brightness" color temp, to get more output but correct colors. I noticed if I took the HB mode, and turned the Green Gain down to -40, it was basically the same brightness as D6500 setup.

So I do see how this yields more light output, the question becomes, if its fully calibrated from HB vs D6500, once the calibration is done, do you actually net out any additional lumens!

AVSCraig

Re: JVC RS4500 (native 4K laser projector)
« Reply #558 on: February 23, 2017, 01:28:24 PM »
Ok this makes more sense now. I just shot mine with the Minolta LS100, and in High Brightness mode I get right at or just over 3000 lumens. The downside is the image is super green, but it would be usable I guess for certain events if extra brightness was needed.

What I want to know is if these units should be calibrated from "High Brightness" color temp, to get more output but correct colors. I noticed if I took the HB mode, and turned the Green Gain down to -40, it was basically the same brightness as D6500 setup.

So I do see how this yields more light output, the question becomes, if its fully calibrated from HB vs D6500, once the calibration is done, do you actually net out any additional lumens!

I'd say that like " dynamic mode " on an Epson or " bright tv " mode on a Sony, you trade accuracy for lumens. Do you think any of your friends could tell after 3 beers, watching the Super Bowl, with the lights on in the room ? I'd say no. We couldn't tell the difference watching " Wheel of Fortune " at 70 foot lamberts - Vanna White looked smoking hot as ever. Or maybe that was my screen starting to smoke...........................

AVSMike

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Re: JVC RS4500 (native 4K laser projector)
« Reply #559 on: February 23, 2017, 05:25:18 PM »
What fabric do you currently have?

EN4K
My Baffle Wall System: https://discuss.avscience.com/index.php?topic=124.msg902#msg902

Mike Garrett
AV Science Sales
585-671-2968
mike@avscience.com

JVC, Sony, Epson, Marantz, Denon, Yamaha, Stewart, Seymour, Screen Innovations, Screen Excellence, DNP, Da-Lite, Triad, SVS, Martin Logan & more.

Re: JVC RS4500 (native 4K laser projector)
« Reply #560 on: February 23, 2017, 10:45:14 PM »
EN4K

Do we have a true reading of what the gain is on the V6 fabric? When I compared my EN4K with a sample of StudioTec 100, using a Minolta LS-100, I can see that the EN4K has a gain of .7.

I'm don't know how that Accucal report has it measured at .84 because mine is no where near that. I wonder if the fabric changed at some point. I noticed the Sound & Vision review has the EN4K measured at a gain of .7 also. 

AVSMike

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Re: JVC RS4500 (native 4K laser projector)
« Reply #561 on: February 24, 2017, 09:30:34 AM »
Do we have a true reading of what the gain is on the V6 fabric? When I compared my EN4K with a sample of StudioTec 100, using a Minolta LS-100, I can see that the EN4K has a gain of .7.

I'm don't know how that Accucal report has it measured at .84 because mine is no where near that. I wonder if the fabric changed at some point. I noticed the Sound & Vision review has the EN4K measured at a gain of .7 also.

Around 0.84. I can clearly see that it is brighter than EN4K, when the two are compared together.
« Last Edit: February 24, 2017, 09:32:07 AM by AVSMike »
My Baffle Wall System: https://discuss.avscience.com/index.php?topic=124.msg902#msg902

Mike Garrett
AV Science Sales
585-671-2968
mike@avscience.com

JVC, Sony, Epson, Marantz, Denon, Yamaha, Stewart, Seymour, Screen Innovations, Screen Excellence, DNP, Da-Lite, Triad, SVS, Martin Logan & more.

Re: JVC RS4500 (native 4K laser projector)
« Reply #562 on: February 24, 2017, 12:54:46 PM »
Light spill on these might be slightly more than the other JVCs, which have always had a slight amount around the image. The reason is this is a true 4K (4096x2160) D-ILA panel, so if you aren't scaling the image to fill the full width, you'll have more spill on each side of the active image than before. This should not be noticeable with a good frame, but it is still there. Spill on top and bottom should be the same as the other JVCs. I didn't see any issues with my review unit.
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mark_h

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Re: JVC RS4500 (native 4K laser projector)
« Reply #563 on: February 24, 2017, 02:03:49 PM »
Kris, the spill I'm talking about is way outside the image frame.   I sit 11' back from my screen and the spill is on me, not the screen.    I've attached an image to show what I see when I hold a card up to the projector;  the rectangle being the projected image and the circular region being the extent of the spill.

With my spare-no-expense cardboard filter in place I have no spill at all.  Just came out from watching a film and I am once again sat in pitch blackness, instead of being lit by the spill.
« Last Edit: February 24, 2017, 02:07:19 PM by mark_h »
My cinema: The Cave

AVSCraig

Re: JVC RS4500 (native 4K laser projector)
« Reply #564 on: February 24, 2017, 02:36:38 PM »
With a 0 IRE test pattern, I don't see this " spill " - is it only certain content ? Bright material ? I guess I need to hold up a piece of paper and test for this. Can't actually see it in my room - and never noticed it with my RS600, so it must be subtle ?

mark_h

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Re: JVC RS4500 (native 4K laser projector)
« Reply #565 on: February 24, 2017, 02:53:21 PM »
It's clearly visible if you hold a piece on of card a few inches from the lens.  Show a 100ire field to make it more obvious. 
My cinema: The Cave

Re: JVC RS4500 (native 4K laser projector)
« Reply #566 on: February 25, 2017, 03:51:41 AM »
Do the light spill change with different zoom settings on the lens?

mark_h

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Re: JVC RS4500 (native 4K laser projector)
« Reply #567 on: February 25, 2017, 04:13:07 AM »
Do the light spill change with different zoom settings on the lens?

Given that others claim not to see it, I'm also wondering the same...

My throw is 26', so I am at the far end of the zoom, with my projected image using only a small amount of the lens.
My cinema: The Cave

mark_h

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Re: JVC RS4500 (native 4K laser projector)
« Reply #568 on: February 25, 2017, 04:30:09 AM »
The other issue with not being able to see it will maybe depend where you sit in relation to the projector.  If the projector's "spill cone" misses your seating position then you wouldn't necessarily see it.  I do sit within my spill cone, which is why I noticed my clothes being lit from light coming from behind me, rather than reflected off the screen...

My cinema: The Cave

AVSCraig

Re: JVC RS4500 (native 4K laser projector)
« Reply #569 on: February 27, 2017, 11:24:01 AM »
Given that others claim not to see it, I'm also wondering the same...

My throw is 26', so I am at the far end of the zoom, with my projected image using only a small amount of the lens.

My projector is 13.85 feet from a 118" wide 2.35:1 screen. It's about as close as possible to my size screen.

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