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Old March 31st, 2011, 07:03 PM   #1
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Re: CineForm Bought By GoPro

There is an excellent reason for flipping that camera for the closer inter-axial. GoPro subjects can get very close to the lens, for that type of 3D image to work the IA needs to be short.
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Old March 31st, 2011, 07:20 PM   #2
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Re: CineForm Bought By GoPro

Quote:
Originally Posted by Mark Pavy View Post
one camera upside down.
But that is indeed the proper way to do it... to get as small an inter-axial distance as possible.
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Old March 31st, 2011, 07:52 PM   #3
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Re: CineForm Bought By GoPro

Yeah, I know why they did it....not everyone wants to film themselves jumping off a cliff with the cameras pointing at their head. I'd just like them to release the prototype (as well) that had an interocular of 61mm versus 32mm on the one that is released.
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Old April 1st, 2011, 08:22 AM   #4
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Re: CineForm Bought By GoPro

What you gain in decreased inter-axial you probably lose in shutters rolling in the opposite direction. these are CMOS sensors right?
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Old April 1st, 2011, 09:17 AM   #5
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Re: Flipped camera compounds rolling shutter?

Posts above split out from CineForm Bought By GoPro
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Old April 1st, 2011, 09:24 AM   #6
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Re: Flipped camera compounds rolling shutter?

Thanks Chris,

The reason I mentioned this was because I've seen shutters rolling in different directions on mirror rigs a lot. I imagine this situation with the GoPro's would be exactly the same effect unless the new gopros have a global shutter or are CCD?


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Old April 1st, 2011, 10:06 AM   #7
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Re: Flipped camera compounds rolling shutter?

My understanding is flipped camera is clocked in reverse, so the rolling shutter matches. Cool huh? While I'm not in the Firmware department, bit I've using the results for sometime -- this is not an issue.
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Old April 1st, 2011, 01:49 PM   #8
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Re: CineForm Bought By GoPro

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Originally Posted by Mark Pavy View Post
Yeah, I know why they did it....not everyone wants to film themselves jumping off a cliff with the cameras pointing at their head. I'd just like them to release the prototype (as well) that had an interocular of 61mm versus 32mm on the one that is released.
Can't you spread the cameras apart to the IA you want, just not use their case, or is the cable too short?

I have to say it: your an Aussie, so don't you have to shoot everything upside down anyway! Sorry, just couldn't resist.
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Old April 1st, 2011, 01:53 PM   #9
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Re: Flipped camera compounds rolling shutter?

The cable is designed for the short IA.
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Old April 1st, 2011, 02:38 PM   #10
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Re: Flipped camera compounds rolling shutter?

@Steve- yes, you're right. I shot a whole lot of ski footage with 2 GoPros with a rig I made myself 8 mths ago. Oh man do I love skiing uphill and catching the lifts downhill- it's all messed up here, with things being upside down!!! lol
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Old April 2nd, 2011, 03:28 PM   #11
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Re: Flipped camera compounds rolling shutter?

They use a negative going clock pulse on the upside-down camera so it runs backwards ;-)
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Old April 3rd, 2011, 03:49 PM   #12
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Re: Flipped camera compounds rolling shutter?

Quote:
Originally Posted by John Reeve View Post
The reason I mentioned this was because I've seen shutters rolling in different directions on mirror rigs a lot. I imagine this situation with the GoPro's would be exactly the same effect unless the new gopros have a global shutter or are CCD?
and this cause a lots of headaches of post department and to all viewer...
usually this is difficult to solve in post, and give you a lot's of strain when you see stereo movie.
It's a bad developing of rig, most of pro beam splitter rig allow you to reverse camera to avoid conflictual rolling shutter.
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Old May 3rd, 2011, 05:23 PM   #13
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Re: Flipped camera compounds rolling shutter?

Can anyone confirm that the shutters are actually synchronized? My understanding after NAB was that the sync cable not only synched menu items and start/stop but also the genlock/shutters. However, I just had a conversation with someone who has used them and I was told that there is no actual shutter clock sync between the two cameras. If this is the case it won't work well for 24fps - 30fps shooting. I'm just looking for another confirmation on this before I buy a couple myself.
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Old May 3rd, 2011, 06:10 PM   #14
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Re: Flipped camera compounds rolling shutter?

The frames are sync'd, and work well for 30p and 25p (no 24p) shooting.
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Old May 3rd, 2011, 06:21 PM   #15
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Re: Flipped camera compounds rolling shutter?

Thanks for confirming things work as expected David. We do a lot of fast action stunt work so we need perfect shutter sync. I'm placing an order this week.
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