Fine Tuning Shutter Speeds + Frames?

D

Dan_The_Man

Active member
Hi there,

I have decided to have a little go at filming something in 3D. For this I will have two 7Ds (One that I own and one that I am renting next week).

I heard somewhere that you need to get the shutter speeds and I guess the framerates going perfectly in synch. How can I fine tune the shutter speed and framerate so that it can run in synch with another camera? I have seen 3D footage from the 7Ds so know that this is possible.

Thanks,
Dan
 
Has no one ever heard of such adjustments? I need an answer on this ASAP, I have been searching google for days but can't find anything.
 
I was at an event in London recently called the Bradcast Video Expo. There was a lot of stands talking about 3D technology. One stand had actually made a rig using two 7Ds and you could view their 3D footage on a polorised screen. It did look amazing, especially when I know I have a 7D sitting right here infront of me!

One of the people at the Expo mentioned synching the shutter speeds to me so that's why I thought I would make a post about it. I think the main goal of synching the frames and shutter is just so you don't get an uneven kind of flickering between the two images - makes sense.

Would be great to get some info on this. I know it can be done.
 
From this blog post: http://dcinema.wordpress.com/2010/01/27/3d-stereoscopy-canon-5d-mkii-and-some-diy-tips-and-tricks/

For 3D stereoscopy to work, both cameras shutters must be perfectly in sync, in fact, really the sensors must be read at identical times down to the millisecond. Right and left eye must be temporaly identical, exposures taken at precisely the same moment. This is especially the case when the camera moves, or a subject moves through the frame. Any temporal shift that results in a mis-match between the relative positions of cameras or subject due to out of sync shutter will compromise the stereo effect.
At the moment, there is no way to sync the shutters on two 5D’s or 7D’s. The other issue is that H.264 is not recording true frame by frame motion in any case. A frame is an approximation, and may share much of the image data from the frame before it or after it (in image areas with limited or no percievable change). This in fact may not make 3D an impossibility but it is certainly a major compromise.
Click to expand...

Also referenced is this discussion: http://www.cinema5d.com/viewtopic.p...a&sid=d774b80aa5ffc8f9d138a737db104c16#p33219
 
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