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EX3 Strobing


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#1 Landon McCrary

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Posted 09 November 2009 - 10:02 PM

Filmed a test on a new EX3 today. Footage looks great as long as I don't pan the camera. All ftg. was shot at 30P 720P. I have never experienced this problem with any other cameras. It doesn't matter how fast or slow I pan the strobing or blurring is pronounced. However, I put the camera on a jib and the boom up did not produce the same effect.

Thanks in Advance for your help.

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#2 David Williams

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Posted 10 November 2009 - 06:19 PM

You always get strobing, it's the nature of watching a series of stills below your maximum perception rate. Usually your brain compensates. You need to figure out what is exacerbating it. Some lighting not matching your frame rate? Shutter not matching your frame rate? Moving the camera to fast? Your play back device doesn't match the frame rate? Lots of options...
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#3 Chris Millar

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Posted 10 November 2009 - 08:24 PM

It doesn't matter how fast or slow I pan the strobing or blurring is pronounced.


Hang on - are we dealing with strobing or blurring ?

How are you monitoring your footage also ...
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#4 Thomas James

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Posted 11 November 2009 - 12:54 PM

You should try shooting at 720p60 instead of 720p30 and that should reduce the strobing.
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#5 Chris Millar

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Posted 12 November 2009 - 02:58 AM

I was thinking a rolling shutter would produce different 'artifacts' for up and down motion compared to panning...

Still tho, not sure what the actual problem is.

Shutter angles might be involved also.
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#6 Landon McCrary

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Posted 19 November 2009 - 05:02 PM

The shot which is a good example of the problem is a wide angle of a building and as a moving tram goes through the frame I pan to follow the tram. It is not very fast at all. During the camera move the video of the building actually jerks or appears as if it is skipping frames. Maybe I should not have said it is strobing. I played this back from the camera to a 17 inch Panasonic 1710 monitor. We also imported the ftg. into a FCP system and it did the same thing. I believe the solution is to shoot in 1080i/60i of which I intend to do and see what happens. I have shot the same thing with an HVX 200 at 720p30p and it does not have a problem. It may be that an EX3 with a rolling shutter just has different characteristics than a CCD camera. I have shot with a RED Camera and never experienced a problem such as this.

Thanks for the comments.
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#7 Chris Millar

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Posted 19 November 2009 - 05:32 PM

hmmm,

ok - hard to say without the settings and footage up on vimeo or likewise

There are lots of EX user on these forums if you'd like us to have a gander
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#8 Landon McCrary

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Posted 19 November 2009 - 06:20 PM

hmmm,

ok - hard to say without the settings and footage up on vimeo or likewise

There are lots of EX user on these forums if you'd like us to have a gander

Thanks for your assistance. I will see what I can do to you tube the ftg.


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#9 Thomas James

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Posted 20 November 2009 - 11:41 AM

Shooting in the 1080i60 format may seem to solve the problem however this is an interlaced format and interlacing is bad because it introduces interline twitter artifacts and is not natively compatible with progressive scan displays. A much better format is the 720p format that shoots at 60 complete frames per second, is fully progressive and will eliminate your stobing and motion blurring prolems. Opponents of the 720p format claim that it is not full high definition 1080 however the 720p format will seem a lot sharper than 1080i and 1080p because it handles motion very well despite its lower spatial resolution.
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#10 Chris Millar

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Posted 21 November 2009 - 07:43 AM

Thomas,

We still don't know what we're looking at.

You talk about 720p 60fps a lot - I'd be interested in seeing some comparative footage if you have any...
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