SLT-a65 Wavy Video

Biodiversity Photography · Jan 15, 2012

I got a hold of the a65 a few weeks ago when it was not available in the states from a source from Hong Kong. I love it. It's been working great except for one issue.

In certain circumstances the video produces a wavy pattern. Kind of like what you might see on a CRT monitor with a really slow refresh rate. It is particularly noticeable in macro, particularly in shadows. It is seen on the LCD, in the digital viewfinder, and it is recorded in video.

I have tried all the possible settings that might make a difference, and the firmware is the latest.

Bad camera???

Paul

http://www.BiodiversityPhotography.org

EvilOne · Jan 15, 2012

Bad memory card, or counterfeit card... ...
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Corkcampbell · Jan 15, 2012

no text

esmall · Jan 15, 2012

What are u using to reply it? I've seen that with video from my a77. I use VLC.
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Biodiversity Photography · Jan 15, 2012

However, it is on the preview and not just the recorded video.

Biodiversity Photography · Jan 15, 2012

It doesn't seem to matter if it is on interlaced or progressive, and it is on the preview, before the video is even being recorded.

Kilrah · Jan 15, 2012

Please post a sample clip.

Are you filming LEDs by any chance when you see this problem? If yes, they might be flashing at high speed, which is common and does cause that kind of problems with all of current cameras using CMOS sensors.

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alpha604 · Jan 16, 2012

What ISO settings? does it change if you drop the ISO?

Using really high iso settings can cause this in video (and preview), though the SLTs seem to be limited at 1600 for video so I wouldn't think that would be the problem...

I would also like to see a sample if you can post the clip anywhere.

Denis247 · Jan 16, 2012

Kilrah said:
Please post a sample clip.

Are you filming LEDs by any chance when you see this problem? If yes, they might be flashing at high speed, which is common and does cause that kind of problems with all of current cameras using CMOS sensors.

--
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http://www.youtube.com/user/kilrahvp

Does it happen outdoors in natural light?

Biodiversity Photography · Jan 16, 2012

Yep, that's it. It is a couple of Liquid Image LED Video(!) dive lights. A light panel doesn't seem to have the same effect.

Any way around it??

Thanks!

Biodiversity Photography · Jan 16, 2012

And which types of LED could I expect this with??

Kilrah · Jan 16, 2012

Any LED panel/display/array that is either dimmed or driven as a matrix. No workaround hat I know of. My $6000 PMW-EX1R pro video camera does exactly the same as the A77 in that regard.

That's due to the rolling shutter used on CMOS sensors. The sensor is read line by line, and as the the LEDs actually flash... when some lines are read the LED's are on, and for others they're off. That's what creates those waves.

If your light is dimmable, try setting it to max power, if it's correctly designed it should then be powered continuously.

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Biodiversity Photography · Jan 16, 2012

Seems to be OK with my lightpanels, so I will work on that. I'll post anything else I find out. Thanks!

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