JVC e-shift5 vs 4K contrast ratio - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 12 Old 09-21-2018, 02:49 PM - Thread Starter
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JVC e-shift5 vs 4K contrast ratio

I'm just curious what everyone's thoughts are on the native contrast of JVC's e-shift projectors vs their new native 4K ones. The top e-shift model claims 160,000:1 whilst the new mid-range 4K is 80,000:1. I realize the new 4K does have dynamic contrast as well. Any thoughts on this? Thanks everyone!
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post #2 of 12 Old 09-21-2018, 03:38 PM
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Originally Posted by IrishHT View Post
I'm just curious what everyone's thoughts are on the native contrast of JVC's e-shift projectors vs their new native 4K ones. The top e-shift model claims 160,000:1 whilst the new mid-range 4K is 80,000:1. I realize the new 4K does have dynamic contrast as well. Any thoughts on this? Thanks everyone!
We will find out what this means soon enough.

The NX9 has a different lens and thus a different iris, which if looking at the Z1 figures tells you anything means it stops down even more than the current eshift units to a level which is too dim to even be useful, so that could explain the higher contrast ratio on that one unit vs the NX7.

The 20LTD also had an iris which stopped down more than normal, my HOPE is that they did NOT put this in the new models, because that would mean the high contrast spec is a somewhat trick. -10 for eg on the iris would not translate to a similar brightness you have on the eshift machines at -10 now. This is something I will be exploring when I do a shootout with the NX7 and X9500. I am most interest to see wide open iris contrast performance. I hope its north of 20k:1.

With the DI on the new models, if you can still get a contrast ratio into the hundreds of thousdands when enabled, that might be very worth while to give up a slight amount to get some resolution in return.

Admittedly, I am most impressed with my JVC contrast when the DI does its thing, not so much its native, which is at 160k, so I am most anxious to see the new models.

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post #3 of 12 Old 09-21-2018, 04:06 PM
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Originally Posted by Javs View Post
We will find out what this means soon enough.

The NX9 has a different lens and thus a different iris, which if looking at the Z1 figures tells you anything means it stops down even more than the current eshift units to a level which is too dim to even be useful, so that could explain the higher contrast ratio on that one unit vs the NX7.

The 20LTD also had an iris which stopped down more than normal, my HOPE is that they did NOT put this in the new models, because that would mean the high contrast spec is a somewhat trick. -10 for eg on the iris would not translate to a similar brightness you have on the eshift machines at -10 now. This is something I will be exploring when I do a shootout with the NX7 and X9500. I am most interest to see wide open iris contrast performance. I hope its north of 20k:1.

With the DI on the new models, if you can still get a contrast ratio into the hundreds of thousdands when enabled, that might be very worth while to give up a slight amount to get some resolution in return.

Admittedly, I am most impressed with my JVC contrast when the DI does its thing, not so much its native, which is at 160k, so I am most anxious to see the new models.
The question of stepping down the iris was explicitly asked at CEDIA and JVC said that no, they don't step it down further than the current eshift models.
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post #4 of 12 Old 09-21-2018, 04:46 PM
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The question of stepping down the iris was explicitly asked at CEDIA and JVC said that no, they don't step it down further than the current eshift models.
Did they mention the 20LTD stops down more than the 'eshift' models?

Because it does

I am DEAD sure I saw lumen output measurements somewhere and the LTD was significantly less lumens at -15 than the normal models.

A nice trick to get to 200k.

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post #5 of 12 Old 09-21-2018, 04:52 PM
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Did they mention the 20LTD stops down more than the 'eshift' models?

Because it does

I am DEAD sure I saw lumen output measurements somewhere and the LTD was significantly less lumens at -15 than the normal models.

A nice trick to get to 200k.
No, but no one explicitly asked the question regarding the 20LTD. They did ask this regarding the new line. It was explicitly asked if this was the case because it would explain some of the improved contrast numbers over the RS4500. They were explicitly told that they do not clamp down further than the existing e-shift line.

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post #6 of 12 Old 09-21-2018, 06:38 PM
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No, but no one explicitly asked the question regarding the 20LTD. They did ask this regarding the new line. It was explicitly asked if this was the case because it would explain some of the improved contrast numbers over the RS4500. They were explicitly told that they do not clamp down further than the existing e-shift line.

All a grain of salt until we can test it mate, which I plan on doing almost first thing when I get it... Sit tight.

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post #7 of 12 Old 09-21-2018, 06:41 PM
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Originally Posted by Javs View Post
All a grain of salt until we can test it mate, which I plan on doing almost first thing when I get it... Sit tight.
You know that it is going to be higher native contrast than the chip in the RS4500. Otherwise they would have just used the RS4500 chip.
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post #8 of 12 Old 09-21-2018, 06:52 PM
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You know that it is going to be higher native contrast than the chip in the RS4500. Otherwise they would have just used the RS4500 chip.
Of course it do.

I am referring to how they arrive at max contrast.

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post #9 of 12 Old 09-21-2018, 07:01 PM
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All a grain of salt until we can test it mate, which I plan on doing almost first thing when I get it... Sit tight.
I'm holding off my order of the RS3000 until I hear from you and arrow's impressions. I am mainly interested in the black floor compared to current models and if additional pumping artifacts are seen to make up for the contrast being half when say the iris in in auto and aperture set to 0. I don't care about pumping on scenes like interstellar 53:30 or end credits. But I do care about it on normal scenes where folks are just talking and maybe one camera view has a bright window in the background and the other is a guy against a wall with no window or a fireplace.
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post #10 of 12 Old 09-24-2018, 12:41 PM - Thread Starter
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Looking forward to the testing! I'm rocking an older RS35 and have been wanting to make the jump to 4K but when I saw the native contrast number of the NX7 vs the current X790, I was a bit confused. I'm not an expert by any means, but I've just always been told to generally focus on the native contrast vs dynamic. The main example that I personally draw from is comparing my JVC to my Optoma HD8600. In one weekend I calibrated both with HCFR and an i1 Pro. The difference was very clear. Blacks: JVC. Brightness and sharpness: Optoma.

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post #11 of 12 Old 09-24-2018, 04:57 PM
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Originally Posted by IrishHT View Post
Looking forward to the testing! I'm rocking an older RS35 and have been wanting to make the jump to 4K but when I saw the native contrast number of the NX7 vs the current X790, I was a bit confused. I'm not an expert by any means, but I've just always been told to generally focus on the native contrast vs dynamic. The main example that I personally draw from is comparing my JVC to my Optoma HD8600. In one weekend I calibrated both with HCFR and an i1 Pro. The difference was very clear. Blacks: JVC. Brightness and sharpness: Optoma.
An Optoma HD8600 would be brighter than an RS35, but it will not be brighter than a current JVC model.
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post #12 of 12 Old 11-04-2018, 05:55 PM
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An Optoma HD8600 would be brighter than an RS35, but it will not be brighter than a current JVC model.
It could appear brighter, DLP whites are disproportionately brighter than the rest of its colors...a hockey game, for example, looks fabulously bright on DLP.
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