Panasonic Ag-AF100 - Red artifacts problem.

You got me. Before I read that article it seemed like a temperature and lighting issue. But that dude took the AF100 to the polar ice caps for Christ's sake and he didn't seem too disappointed with it.
 
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I've had a less-obtrusive version of it show up.

For me it only appears as a thin horizontal red line near the bottom of the image, when shooting at high ISO (I've only noticed it appear on my camera at 1250+) when there is also an over-bright light source or burnt out area in shot. That burnt out area can be pretty small (a strip specular highlight on polished metal seemed to do it one time) but it has to be there.

For me, the issue went away by adding more light to the scene so I could turn down the ISO, or by reframing to get the hot spot decently out of shot.

I just assumed it was some sort of sensor overflow issue, mine seemed more likely to be electronic in origin from the way it behaved rather than anything physical like internal reflections, and it always seems to show up in more or less the same part of the image. I don't have footage in front of me to check, so I don't know if it is always the same row of pixels, but it looked like it could be.

It looks a little like the bloom spikes one gets from CCD sensors, but CMOS sensors are meant to be resistant to that, and I'm not sure why that would be gain dependent.

So for me it has been no more than a minor irritation. Sorry to hear it is a lot worse on some cameras, I guess it may just depend on the individual sensor.

Cheers, Hywel.
 
I've never seen this artifact and more importantly I have not gotten any complaints from clients about the artifact either. I've shot tones of white screen, used backgrounds with blown out highlights, you name it. Ive not seen it.
 
Mark Smith said:
I've never seen this artifact and more importantly I have not gotten any complaints from clients about the artifact either. I've shot tones of white screen, used backgrounds with blown out highlights, you name it. Ive not seen it.
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Then you are lucky cause it bit me. Like I said it was an anomaly so much so that Panasonic repair took 3 weeks and racked up 150 usage hours trying to figure out the problem. My other Af100 was perfect. No weird artifacts whatsoever.
 
Dear Panasonic.

Dear Panasonic.

Yup, I think we need to send both of the cameras back to Panasonic UK and ask them to run the tests for longer period and maybe in sub-zero conditions. They say there is no problem with the camera, but I think we have proved them wrong. I´m going to send this thread to the Panasonic repairs so they can see that it´s really happening, not just us. I just hope that they can check the link, last time they said they don´t have permission to check external links from internet.
 
Mail sent to Panasonic

Mail sent to Panasonic

Mail was sent to Panasonic UK Repairs few minutes ago, now we sit down and wait their response.
 
Hi Mark, it happened with huge amount of back light and the subject is not lit properly or at all. I'd say it's under the poorest situations one can film in but no way around it. For me and op it was during a could day. When you film in the conditions you mentioned was the subject lit with some source of lighting?
 
Babu said:
Hi Mark, it happened with huge amount of back light and the subject is not lit properly or at all. I'd say it's under the poorest situations one can film in but no way around it. For me and op it was during a could day. When you film in the conditions you mentioned was the subject lit with some source of lighting?
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You are right, subject was not lit and did have quite a strong backlight (in most of the cases). We´ll keep you updated on this issue, we really need an answer quickly to solve this problem.
 
I wouldn't completely discount power issues. The cameraman in the arctic seems to mostly use brick batteries, & recorded onto a Nano.
 
Well, I fired up my AF100 for the first time tonight and was doing some tests with it. Had the Voightlander 50mm .95 on it (sweet lens).

Didn't get any screen grabs, but noticed this same effect, only in blue! The situation was: Back-lit, low light interior. 800 ISO, .95f, 1080 24p. I am hoping it was just due to a setting or something. Will post more later.
 
Bern Caughey said:
I wouldn't completely discount power issues. The cameraman in the arctic seems to mostly use brick batteries, & recorded onto a Nano.
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A few years back we took one of our winter courses to Antarctica. Canons lend us half dozen XL1's and Apple let us have some Mac Books for editing. First thing we were told by the people organizing the trip for us was the battery issue under subzero temperatures. In fact, I remember reading something from Canon indicating that although the cameras were rated to work in temperatures between 0-40 degrees Celsius, they will be capable of working in lower temperatures. The problem, as Canon indicated, is battery performance deterioration at subzero temperatures.
We resolved the issue by carrying additional batteries and keeping them inside thermo insulated pouches. Then, we kept changing and rotating batteries so no battery was expose to the extreme cold temperatures for too long. Still, we had occurrences of single color horizontal lanes across the frame while shooting. Change the battery for one of the ones in the insulated pouches and the issue immediately went away.
Of course those were Canon cameras and Canon batteries. I do not know if our experience translates across manufactures but it would very easy to test. An insulated lunch box and some extra batteries will be all it takes.
 
chervas said:
A few years back we took one of our winter courses to Antarctica. Canons lend us half dozen XL1's and Apple let us have some Mac Books for editing. First thing we were told by the people organizing the trip for us was the battery issue under subzero temperatures. In fact, I remember reading something from Canon indicating that although the cameras were rated to work in temperatures between 0-40 degrees Celsius, they will be capable of working in lower temperatures. The problem, as Canon indicated, is battery performance deterioration at subzero temperatures.We resolved the issue by carrying additional batteries and keeping them inside thermo insulated pouches. Then, we kept changing and rotating batteries so no battery was expose to the extreme cold temperatures for too long. Still, we had occurrences of single color horizontal lanes across the frame while shooting. Change the battery for one of the ones in the insulated pouches and the issue immediately went away.Of course those were Canon cameras and Canon batteries. I do not know if our experience translates across manufactures but it would very easy to test. An insulated lunch box and some extra batteries will be all it takes.
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Thank you, very interesting. I´ll be trying this tomorrow, what I had in mind was first to recharge the battery to its full capacity and then leave it to the subzero conditions for couple of hours. After that I´ll see how it functions compared to the warm batteries. Does that sound like a valid test? Anton Bauer batteries would be very nice, but also very expensive, they should work at -30 celsius degrees. Tomorrow we hopefully know more about this.
 
Tyrant Lizard said:
Well, I fired up my AF100 for the first time tonight and was doing some tests with it. Had the Voightlander 50mm .95 on it (sweet lens).

Didn't get any screen grabs, but noticed this same effect, only in blue! The situation was: Back-lit, low light interior. 800 ISO, .95f, 1080 24p. I am hoping it was just due to a setting or something. Will post more later.
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Horizontal lines? Or around objects...This could be purple fridge or lateral aberration due to very wide aperture you used, try to stop it (f/1.4) down a little bit...that might help.
 
Did you by any chance have a UV filter (or any other filter) on your lens? I just had the same problem and took off the UV filter and the aberration was gone.
 
I did run into this red line shooting in cold weather this weekend. Didn't notice it until I checked the footage and it was recorded on the Samurai so it has nothing to do with SD-cards since it was present at the SDI output. It was a contrasty scene and it lasted a couple of frames each time. I think I saw it in two clips.

View attachment 47986
 
editman said:
I did run into this red line shooting in cold weather this weekend. Didn't notice it until I checked the footage and it was recorded on the Samurai so it has nothing to do with SD-cards since it was present at the SDI output. It was a contrasty scene and it lasted a couple of frames each time. I think I saw it in two clips.

View attachment 47986
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Hi!, "Nice" to see that you have same problem :) We have exactly the same problem! Did you use normal batteries or some pro batteries like Anton Bauer? This problem seems to happen only in cold, we haven´t been able to recreate this indoors. This is very interesting. We sent our camera body to the UK repairs again, this time hopefully for longer testing period. But I´m really starting to think that cold is the reason..
 
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