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-   -   Call to JVC - split screen (https://www.dvinfo.net/forum/jvc-gy-hd-series-camera-systems/50935-call-jvc-split-screen.html)

Jiri Bakala October 6th, 2005 10:06 PM

Quote:

Originally Posted by Steve Mullen
2) Gross levels of smear on one side. This is very clear in the sunset shot. No one would use a shot with that much smear. It never should have been published as an example of anything but gross over-exposure.

You are not talking about this, are you?
http://www.time-code-media.de/split.jpg
Which sunset shot is it?

Steve Mullen October 6th, 2005 11:38 PM

I don't see that as a sunset. It looks like the SSE you get when you have not correctly color balanced.

There is a series of shots of a setting sun over a pier where the sun is a ball of super bright light with a mear the width of the sun going downward.

Michael Maier October 7th, 2005 01:04 AM

So Mel, you have a NTSC model and have the split screen even when there's enough light? F4-f8 sure seems like enough light.

Robert Castiglione October 7th, 2005 06:18 AM

For those experiencing SSE you should definitely try using only manual white balance (as recommended above) - I have been doing so and it looks very promising at the moment for sharply reducing incidence of the problem. I will keep testing.

Rob

Jiri Bakala October 7th, 2005 08:56 AM

Quote:

Originally Posted by Steve Mullen
There is a series of shots of a setting sun over a pier where the sun is a ball of super bright light with a mear the width of the sun going downward.

I remember those, they didn't seem overexposed at all to me. Yes, the sun itself was of course hot but a sunset is a pretty common shot, especially for nature documentaries and we need the flexibility to be able to shoot such shots.

Mel Namnama October 7th, 2005 12:11 PM

Quote:

Originally Posted by Michael Maier
So Mel, you have a NTSC model and have the split screen even when there's enough light? F4-f8 sure seems like enough light.

Yep, I believe I had adequate lighting..What concerned me more was the faint but consistently present mid screen verticle red band. Once I keyed on to it, I saw it everywhere in varying degrees...different shots/settings & tape. Is this a free sefx from JVC?...There's no button on the camera for it. I prefer adding all effects on my NLE. I returned the camera in hopes that the company will remove the "special" feature.

Steve Mullen October 7th, 2005 12:31 PM

Quote:

Originally Posted by Jiri Bakala
I remember those, they didn't seem overexposed at all to me. Yes, the sun itself was of course hot but a sunset is a pretty common shot, especially for nature documentaries and we need the flexibility to be able to shoot such shots.

When have you seen a pro shoot a sunset with vertical smear? Never!

Any time you get smear that wide from the sun -- the shot is over exposed by definition.

To do a sunset correctly one must bias the exposure for the sun which means the beach would be much darker. This guy likely did an AVERAGE exposure.

In any case, the shot could never have been used because of the smear -- the SSE was irrelevant.

Stephen L. Noe October 7th, 2005 01:04 PM

I remember the shot. The white balance was off as well.

Christopher C. Murphy October 7th, 2005 01:36 PM

As many of us were (or still are) former JVC HD10 users - I've read this entire thread and thought about the times we all talked about new firmware for the HD10. We really wanted it and asked for it, but never got it. Granted, the "limitations" weren't hidden when we bought the camera.

It's strange, but my HD10 had that horrible streak too...except it was green. It showed up when shooting anything bright like chrome or the sun.

I don't think it's to much to ask for them to stop by here more than once a year and talk about their defective or limited products.

The only people who deserve beers are the people trying to make a living with defective and limited gear!!!!!!!!!

Steve Mullen October 7th, 2005 03:28 PM

Quote:

Originally Posted by Christopher C. Murphy
It's strange, but my HD10 had that horrible streak too...except it was green. It showed up when shooting anything bright like chrome or the sun.!

This streak is called "vertical smear" and is present on EVERY "IT" CCD camcorder. It is inherent it IT CCDs which are used in almost every camcorder.

Naturally, the higher the pixel count and the smaller the CCD -- the greater probability of smear. It can be any color.

Over time, CCD smear rating is getting better and in some more expensive camcorders is now about -128dB.

To imply it has anything to do with JVC is, frankly, to reveal a lack of experience.

Michael Maier October 7th, 2005 04:50 PM

Quote:

Originally Posted by Steve Mullen
This streak is called "vertical smear" and is present on EVERY "IT" CCD camcorder. It is inherent it IT CCDs which are used in almost every camcorder.
Naturally, the higher the pixel count and the smaller the CCD -- the greater probability of smear. It can be any color

The difference between 1/3" and 1/2" must be like night and day when it comes to smear then. Because I have shoot with Sony DSR300 and Panasonic DVC200 pointed directly to car head lights and stadium spots and never got smear.

Werner Wesp October 7th, 2005 05:01 PM

Or perhaps you exposed the footage somewhat less...

Michael Maier October 7th, 2005 05:09 PM

Hey Werner, if you are referring to my post, I don't think I could have underexposed at all, since I wanted detail in the background, and if I had underexposed, the background would have gone dark.

Jiri Bakala October 7th, 2005 06:20 PM

Quote:

Originally Posted by Steve Mullen
When have you seen a pro shoot a sunset with vertical smear? Never!

Any time you get smear that wide from the sun -- the shot is over exposed by definition.

To do a sunset correctly one must bias the exposure for the sun which means the beach would be much darker. This guy likely did an AVERAGE exposure.

In any case, the shot could never have been used because of the smear -- the SSE was irrelevant.

It seems that you never shot a sunset, Steve. The sun will be ALWAYS overexposed. No matter what camera, what size chip, to expose for the sun, you would get nothing in the foreground, all pitch black and the sun would be still overexposed. Vertical smear is an unfortunate characteristic of CCD sensors and sometimes cannot be avoided, especially with smaller chip cameras. When I shot sunsets with my DSR500, the sun itself was overexposed but there was no smear and that's thanks to the bigger size chip. With the HD100 there will likely be some smear in sunset shots, as well as, in night-time shots with car headlights but there should not be SSE.

I am pretty tired and don't have time for your on-going defence of this particular issue and I am just gonna leave the battle to someone else.

However, I want to mention one more thing, the suggestion of white balancing in low light. One technique used by electronic cinematography is NOT to white balance for every setup and to use a pre-set WB instead. The reason is that the process of white balancing removes hues that are dominant in the shot (i.e. WB with blue gel minimizes blues and 'warms up' the image). If one manually WB in the evening (sunset) the camera electronics will attempt to 'compensate' and remove the warm hues that make a sunset what it is, giving the image a non-descript flatness. Also, in order to create a colour continuity it is important not to change WB between setups, among other settings (of course that doesn't apply when switching between daylight and incandescent lighting). So, even rental houses set up high end cameras (like CineAlta and others) to the liking of the DP/client and then the settings are not typically changed and certainly one doesn't manually white balance.

Guy Barwood October 7th, 2005 06:50 PM

"The difference between 1/3" and 1/2" must be like night and day when it comes to smear then. Because I have shoot with Sony DSR300 and Panasonic DVC200 pointed directly to car head lights and stadium spots and never got smear."

One thing to remember is the smear is related to the size of the pixels right?
THese cameras have many more pixels in the same size CCD so when it comes to things like smear and sensitivity they will perform like a much smaller SD block. So a 1/3" HD CCD will proabably have pixels about the size of a 1/6" or smaller SD CCD. Your probably going to need a 2/3" HD block to get the performance of a 1/3" SD block with 1280x720.

Still, I havn't heard of the Sony 1/3" block having such bad smear and it has about the same size pixels.

Anyone know who actually makes the CCD block in the JVC?

Christopher C. Murphy October 7th, 2005 07:30 PM

Guy, I haven't had any smearing with the Z1U. I haven't shot into the sun yet, but I will try this weekend.

Stephen L. Noe October 7th, 2005 08:32 PM

FWIW- The XL-H1 smears in the sun too. If you download the attempted CA shot over on the H1 community you can look at a nice smear from the sun all the way to the bottom of the frame.

Heath McKnight October 7th, 2005 09:44 PM

We're getting way off topic here, but one shouldn't shoot into the sun to begin with, because of all the reasons we've discussed and more.

heath

Steve Mullen October 7th, 2005 10:40 PM

Quote:

Originally Posted by Guy Barwood
"Your probably going to need a 2/3" HD block to get the performance of a 1/3" SD block with 1280x720.

Still, I havn't heard of the Sony 1/3" block having such bad smear and it has about the same size pixels.

Anyone know who actually makes the CCD block in the JVC?

Sony's Hyper HAD CCDs have really, really low vertical smear. Nevertheless, trying to shoot a direct sun and keep the forground visable is exceeding the exposure latitude one would expect from a 1/3-inch CCD. It's simply not good practice as was bourne out by the results.

Guy's right -- for those tough situations there's a reason pros buy camcorders with 1/2-inch and 2/3-inch CCDs!

And, it is rumored that Sony makes the CCDs.

Heath McKnight October 7th, 2005 10:45 PM

I've heard that Sony has made the Canon XL H1's chips.

heath

Werner Wesp October 8th, 2005 04:07 AM

Quote:

Originally Posted by Michael Maier
Hey Werner, if you are referring to my post, I don't think I could have underexposed at all, since I wanted detail in the background, and if I had underexposed, the background would have gone dark.

No, no, I meant that if you exposed less with your 1/2 inch camcorders, you are likely to get less smear...

Michael Maier October 8th, 2005 04:18 AM

I know. But I didn't expose less, since the background was not dark at all.

Werner Wesp October 8th, 2005 04:45 AM

Ah, well, that clearly shows how big the difference is. Keep in mind though that the CCD's are bigger AND there are lesser pixels on each...

Mel Namnama October 15th, 2005 12:10 AM

Repaired camera?
 
Hello Everyone,
I picked up my HD 100 from the JVC repair shop ( same unit) . The tech was able to lessen the degree of SSE but could not completely eradicate it. He basically said that it is all new technology...that SSE is inherent with this HD camera. He said he "corrected the gain" and showed me a monitor with an isoelectric line (I had no clue what it represented ), mid way through the line was a break ...he said the camera was under spec. The tech said to test it and bring it back again if I was not satisfied.

Robert Castiglione October 15th, 2005 12:55 AM

Dear Mel,

Please let us know how you get on and whether you are satisfied with the result.

I must confess to coming around to Steve Mullen's point of view on the SSE. Even though I can reproduce the SSE under specific and awkward conditions, it has not (thus far) been a factor in either of the two shoots that I have done even though both were under low light conditions. I have found that the camera actually performs well under low light.

My overall impression after using this camera quite a bit (mines a PAL unit) is that it is a terrific unit with a lot of potential.

Rob

Mel Namnama October 22nd, 2005 11:45 PM

Hello Robert,

The incidence of SSE has lessened and I have not seen any verticle smear since the service of my camera. The initial "shock" of SSE has subsided and I
am following the posted preventative measures to minimize its occurence. I am satisfied...thanks to the JVC technician.

On a totally different and insignificant note...I was watching the tube on my HD lcd and I kept seeing a very large dead white pixel in the upper right hand of the screen. The channel was "INHD", the program " King of the Ring" ( ultimate fighting show). The dead pixel was only on this channel, in half of the shots, showing up in dark/black backrounds..one of the camera men was weilding an HD100...I thought it was amusing.

Guy Barwood October 22nd, 2005 11:55 PM

I've seen quite a lot of dead pixels on TV recently, as many as 3 at a time. More cameras need the pixel masking the HD10x has

Robert Castiglione October 23rd, 2005 01:20 AM

Dear Mel,

Excellent news. Yes, the whole SSE thing feels like a past event for me as well. Is it possible for a camera to heal itself? Maybe by the using the camera for a while it have burnt in or something. Alternatively, It could just be that I have been following all the SSE recommendations on this site and just don't get the problem any more when I am shooting. In any event, I am certainly going to get it checked by JVC at the end of the month to get the latest software for the PAL version. I wanted to wait a few months to give JVC an opportunity to try and sort things out with software.

It was always one of concerns about the SSE thing that it would put people off buying this camera and that would be a great shame.

Rob


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