May 2, 2016 at 1:09PM

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Sony A7s II Strange Artifacts

Hi All

I'm currently reviewing some rushes and have noticed some strange artifacts on some of the footage. The issue has occurred very intermittently (twice for short periods on an eight day shoot) but renders the footage unusable.

The problem is prominent on the left side of frame in this clip - https://vimeo.com/165051117

Wondering if anyone has seen this before. It was quite hot on both occasions so heat is a possible cause. Could overheating cause this kind of problem?

Any help would be much appreciated.

Thanks,
Joey

9 Comments

I should add that I was recording direct to a Atomos Ninja Blade.

May 2, 2016 at 1:21PM

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That might be the heat.

Is there actually something in front of the camera and very out of focus? Then it will has some artefacts if you would grade it but not from your out of camera footage.

Because it's a A7s II you still have warrenty for it. Send it in and wait for what they say.

May 2, 2016 at 1:33PM

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Eric Halbherr
Director, DP, Editor, Creative Storyteller
1609

Hmm, if I have to guess I would say those look like faulty marco blocks, more H.264 than Prores like.

Are you sure this is what it looked like when it came straight out of the Atomos?

May 2, 2016 at 2:04PM, Edited May 2, 2:09PM

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Cary Knoop
Member
1792

Does this happen when you record without the atamos?
How long had you been recording for?
what codec were you recording in?

May 3, 2016 at 12:43AM

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Thanks for the responses guys. To answer your questions:

Eric - I'm not sure exactly what you mean but there's nothing in front of the camera. If I need to I will send it back on warranty but I'd prefer not to have to do that.

Cary - Yes this is the ProRes 422 footage straight out of the atomos

David - I haven't been able to test without the atomos because I only noticed this problem after the shoot. On both occasions it happened towards the beginning of the day, but as a I recall it was very hot. We were shooting in Indonesia with temperatures approaching 100.

Thanks

May 3, 2016 at 1:08AM

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My advice would be test without atomos, on every single codec, take at least 10 seconds of each and see results.

May 3, 2016 at 5:14AM

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Hi David,

The problem with this approach is that the issue is so intermittent. There's no way of knowing when it's going to happen no way (as far as I know) of precipitating it.

Thanks

May 3, 2016 at 6:02AM

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Joey Bania - What lens do you have on there?

May 4, 2016 at 11:53AM, Edited May 4, 11:53AM

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I've a friend who had some similar problems on his A7s shortly after he bought it. It turned out to be something like dead pixels or so... Not quite sure. But you might want to send it in.

May 6, 2016 at 9:16AM, Edited May 6, 9:16AM

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Robert Friedriszik
Videographer
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