EX1 compare to GY-HM700U

L

Lor

Well-known member
Has anyone done a comparison between the EX1 and JVC GY-HM700U? The JVC GY-HM700U price seems quite reasonable.
 
I have not had the chance to compare cameras yet but looking at the photos and specs, JVC seems to have a great form factor. The real question will be the net effect difference of chip sizes.

Ned Soltz
 
I was looking at the photos of the GY-HM700U and its short specs, it looks pretty nice. It uses 3CCD and have a interchangeble lens as compare to EX1. I'm not sure about the size of the glass though.

By looking at the price at BH, the GY-HM700U is only a $1000 more. Perhaps I should compare this HM700U to the EX3 which cost over 8 thousand dollars.
 
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The chips are only 1280x720 - so there's going to be some pixel-shifting to get to 1080. Hope they aren't the split-screen type of sensors.
 
So if Barry is correct, it's worse than what Kenn has posted. Okay, so without knowing exactly what pixel-shift means or involves, it's basically means it's not as good as a true 1080p as the EX1 is, correct?

One more thing, I was reading the specs and it has this sentence in it.

The camera features an "image flip" function that corrects for the inverted image produced by prime lenses.

Is that mean I can use a 33mm adapter without flipping since the camera as a built-in image flip functionality?
 
Lor said:
So if Barry is correct, it's worse than what Kenn has posted. Okay, so without knowing exactly what pixel-shift means or involves, it's basically means it's not as good as a true 1080p as the EX1 is, correct?
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Not necessarily. Spatial offset works. And the JVC is using CCD chips, not CMOS, so it will have a big difference in performance from the EX1 regardless.

If it truly is a 1280x720 spatial offset system, it should be able to perform very well as a 1080p camera. If it's 960x540 with H/V offset, then it'll do great as 720p and it'll do okay as 1080p, but not as sharp as an EX1 or HPX300.

We'll have to see how it actually performs. I am unaware of any 1280x720 1/3" progressive chip that can do full 60p, so I suspect that this is more along the lines of the Sony V1U, which was introduced as having "1920x1080 sensors" but in reality had 960x1080 with diamond-shaped spatial offset and interpolation. As far as I know it's not possible to do 1280x720x60p at the 1/3" size.

The camera features an "image flip" function that corrects for the inverted image produced by prime lenses.

Is that mean I can use a 33mm adapter without flipping since the camera as a built-in image flip functionality?
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Yes, that's what that should mean. The HD200 had it, and the new HPX300 has it. There's LCD flip, and then there's actual image inversion, and the HD200/HPX300 have the "good kind", the actual image inversion.
 
Barry_Green said:
I am unaware of any 1280x720 1/3" progressive chip that can do full 60p, so I suspect that this is more along the lines of the Sony V1U, which was introduced as having "1920x1080 sensors" but in reality had 960x1080 with diamond-shaped spatial offset and interpolation. As far as I know it's not possible to do 1280x720x60p at the 1/3" size.
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From Article: I am told by JVC that the image processing and encoder are newly designed for the HM700. The native resolution of each of the three 1/3rd-inch CCDs is 1280x720, and an additional boost in resolution is provided by a newly developed type of spatial offset (not the traditional horizontal / vertical one-half pixel shift process, but a new form of spatial offset exclusive to JVC and designated as their Adaptive Pixel Correlation Technique). This allows the HM700 to acquire full 1080p as well as 720p.


Barry, Are you saying then that this article is inaccurate?

Bill
 
If that's what they told Tim, then that's what they told him. The only way he would have of knowing this is if someone at JVC told him, because the specifications aren't published anywhere.

I am unaware of anyone who's made anything approaching a 1280x720x60p CCD at 1/3". JVC's initial approach was two stitched-together smaller CCDs. Sony's and Canon's approach were interlaced chips. And Panasonic went with 960x540x60p progressive. In order to get 1280x720 progressive CCDs they'd have to double the readout of anything that's been done before. Have they? May very well be. But if they have, it's unprecedented and a massive breakthrough.

JVC doesn't publish the spec for pixels. I'll have to ask Tim who told him they were actual 1280x720 chips.
 
I don't get why 1280x720 @ 60p out of a 1/3" chip would be a massive breakthrough.
We are getting 1920x1080 @ 30p out of a 1/2" for over a year now. Technology moves quickly.
 
Barry_Green said:
If that's what they told Tim, then that's what they told him. The only way he would have of knowing this is if someone at JVC told him, because the specifications aren't published anywhere.

I am unaware of anyone who's made anything approaching a 1280x720x60p CCD at 1/3". JVC's initial approach was two stitched-together smaller CCDs. Sony's and Canon's approach were interlaced chips. And Panasonic went with 960x540x60p progressive. In order to get 1280x720 progressive CCDs they'd have to double the readout of anything that's been done before. Have they? May very well be. But if they have, it's unprecedented and a massive breakthrough.

JVC doesn't publish the spec for pixels. I'll have to ask Tim who told him they were actual 1280x720 chips.
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This is what I was told by JVC representatives and they confirmed the technical specs of my article the day it was published. I assume they are using the same technique as with the the HD100/200 series cameras by combining two 640x720 chips x RGB and reading out to two image processors. This design caused some "split-screen" issues for both Barry and I back when the original HD100 was released (2005) but JVC seems to have worked out how to maintain calibration.
 
dashwood said:
This is what I was told by JVC representatives and they confirmed the technical specs of my article the day it was published. I assume they are using the same technique as with the the HD100/200 series cameras by combining two 640x720 chips x RGB and reading out to two image processors. This design caused some "split-screen" issues for both Barry and I back when the original HD100 was released (2005) but JVC seems to have worked out how to maintain calibration.
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If it's two chips then that makes more sense and I can see that. It will be most interesting to see the results; this is definitely a unique approach. JVC has always been a very innovative company.
 
Seems like my theory was correct. This camera is surelly one to watch out for. It wasn't on my radar, but seems like the best bet for sports (at least on paper).
 
Is anyone running tests on this camera? I'm personally interested for 2 reasons:
it's quicktime .mov file abilities and the fact it still has CCD chips.:beer:




1/3" interline-transfer CCDs ?? (From tech Specs)


Wonder what this means?



Thanks
Bill
 
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Interline Transfer is standard technology for video cameras; all it really means is that you don't need a mechanical shutter, the chip is able to do it electronically.
 
MrBill said:
Is anyone running tests on this camera? I'm personally interested for 2 reasons:
it's quicktime .mov file abilities and the fact it still has CCD chips.:beer:
Thanks
Bill
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From our JVC training:

Optical block

  • New patented 3-CCD optical system
  • Diagonal Spatial Offset with Adaptive Pixel Correlation Technique
  • More than 900 lines resolution
  • 1920x1080p 4:2:2 processing (DSP)
  • Switchable 1080i or 1080p / 720p scanning
**1/2 Diagonal H/V Spatial Offset 720x1280 to 1920x1080

Recording Media / Format

  • Two Hot-Swappable SDHC slots, Cat. 6 media only
  • Single SxS slot on KA-MR100G XDCAM EX recorder
  • Simultaneous recording to SxS and SDHC in .MP4 format
  • 35 Mbps Recording .MOV and XDCAM EX (MP4)
You will need the KA-MR100G XDCAM EX recorder to unlock XDCAM EX format.

It is instant Direct to Edit .mov files to Final Cut Pro 6. Immediate editing off SDHC card. You can drag and drop into the timeline and the Log & transfer plug-in is Faster than real-time (x5) file transfer.

I think the new move by JVC is smart and great. I wish we had the camera to play around with.
 
Out of the blue my JVC rep called and offered a special Pre-NAB price on this Camera.
Very attractive :)
 
Barry, Can we get a separate Line item for the JVC?


WOW I became a senior member overnight-cool.

Thanks, Bill
 
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