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-   Canon XL H Series HDV Camcorders (https://www.dvinfo.net/forum/canon-xl-h-series-hdv-camcorders/)
-   -   disappearing hot pixels (https://www.dvinfo.net/forum/canon-xl-h-series-hdv-camcorders/106776-disappearing-hot-pixels.html)

Floris van Eck March 9th, 2008 06:21 AM
I am picking up my camera tomorrow. I already got a letter from ETB (repair partner) which states: housing cleaned, videoheads cleaned and pixels reconfigured (sounds like pixel mapping).

Marty Hudzik March 9th, 2008 10:52 AM
Great to hear! I hope it all works out great for you. I can't remember if you were able to reproduce this at will or not.....were you? If so, it will be great to get it back and change your camera to the exact settings and situation that caused the hot pixels to appear and then know 100% for certain that it is resolved. Personally, I have had experiences where the few hot pixels I have seen have disappeared for a while only to return later....so for me it would be hard to 100% verify immediately if it was fixed.

Thanks.

Floris van Eck March 9th, 2008 12:14 PM
I think they will have ways to test this. For example, when you set gain to -18db you have the highest chance of seeing those pixels. But of course they can never be completely sure. We'll just wait and see.

Lou Bruno March 9th, 2008 05:20 PM
That is the correct reason due to the increase in (micro) voltage to the pixels in the higher DB range. To see the dead pixels, wrap the camera up in a blanket for an hour and place at the highest DB gain....they will be present.


Quote:
Originally Posted by Marty Hudzik (Post 766849)
Off the top of my head I would say that I have seen it 3-4 times in the last year. I was testing a LetusXL the other day and it this adapter eats light for lunch. I was indoors so I stepped up the gain to +6 and I didn't see it. But when I pushed it to +12 they showed up. Then I stepped back down to +6 and they were visible still. All the way down to zero and I could barely make them out.

Later, when I started at 0 they were gone. Is is possible these things actually "heat" up when set to higher gain and then cool down? I wouldn't think so but I guess it is possible cause they aren't there, appear after gaining up and then linger.....hmmmm....

Marty Hudzik March 9th, 2008 05:44 PM
That may be true but I recently shot an event in Ohio in February, it was 30 degrees outside and probably not all that warm inside either. I was at +3 gain and the hot pixels were there immediately. I had to go to 0db and use a 1/30th shutter to make up some light. Still, I could see one of these bad boys in several shots.....despite the camera having been "cold". So I think we can rule out that heating up is the only cause of this issue.

This is not a scientific theory, but it seems to occur more often than not with the 20x lens. I can't recall a single time that I have seen these with the 16x manual lens. Just a thought.


Quote:
Originally Posted by Lou Bruno (Post 839727)
That is the correct reason due to the increase in (micro) voltage to the pixels in the higher DB range. To see the dead pixels, wrap the camera up in a blanket for an hour and place at the highest DB gain....they will be present.

Floris van Eck March 10th, 2008 03:15 AM
I picked up my camera today and the image is very clean. The difference between before and after is huge, especially at -18db. The weird thing is that the repair guy could not reproduce my problem. He did remap the pixels just in case.

I am happy that those pixels are gone and I hope I will never see them back.

Marty Hudzik March 10th, 2008 10:01 AM
I am glad you are happy with the results but I am confused as to how they remapped pixels they could not find as bad? Did they just reconfigure the general region that you had the bad pixels based on pre-exising footage?

Quote:
Originally Posted by Floris van Eck (Post 839926)
I picked up my camera today and the image is very clean. The difference between before and after is huge, especially at -18db. The weird thing is that the repair guy could not reproduce my problem. He did remap the pixels just in case.

I am happy that those pixels are gone and I hope I will never see them back.

Floris van Eck March 10th, 2008 04:41 PM
Marty, I am also puzzled but this what they told me. I included a tape with the pixels recorded so I guess they used that. But like I said, it is completely clean now so I am very happy and hope it will stay like this.

Henrik Joensen March 27th, 2008 11:31 AM
floris,

As promised, new sensor for my A1 costs euro 817,00.

Heftly.

Floris van Eck March 27th, 2008 01:02 PM
Did you had to pay for it or was it still under warranty?

Henrik Joensen March 27th, 2008 03:35 PM
I bought the camera in NY and Sagemax will cover it. Apparantly
Canon only gives 3 month guarantee on repair work in Europe.


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