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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Split screening the Sensor 2k+2k for 3D

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cinemano

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Hello,

What stereovision lens set can one recommend for splitting the full frame to two 2ks? (left eye and right eye)

Then in post production one can seperate them and blend them for polarisation 3d export no?

Shouldnt remain a big secret, 3d is a clear a present future for all.
Two reds on a rig is all very nice but a financial and heavy weight challenge for most.
 
Um- how would that work? The whole idea of 3D is two views taken from different perspectives. If your eyes were so close to each other they touched you wouldn't see 3D.

Noah
 
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Yes thats what i mean.. someone had a link to an adapter like that called a stereovision lens. but its not for the red
 
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er... okayyy .. anyone else?
 
I know movies in the early 80's like jaws 3-d were shot using a single camera. they called it over under 3-D, or Arrivision 3D. it uses a prism of some kind i believe and does exactly what you imply. record both frames on the same camera.

I've seen them kicking around Los Angeles, and believe you can get them in pl mount.
 
I seem to recall Canon offering a similar mount for the old XL1 that was two eyes. Hmm. I like the idea of having two PL mounts getting two 2ks. Although even then you wouldn't be using the full sensor. There's probably enough room to put two anamorphics side-by-side
 
I think the XL1 solution split the picture fullframe to the upper and lower field of the interlaced picture.

So maybe there could be a solution spliting 3D to different frames of 3k@ 48 or 50 fps?!
 
I am lacking some tech terminology, but I'll give it a try....
Since the Red can record 48 fps and above, one could actually record switching back and forth from one lens to another, giving a total of 24fps.
Even frame1-left lens, odd frme 2 -right frame.
You could in theory shoot 3K in stereo :)
 
albert rudnicki said:
I am lacking some tech terminology, but I'll give it a try....
Since the Red can record 48 fps and above, one could actually record switching back and forth from one lens to another, giving a total of 24fps.
Even frame1-left lens, odd frme 2 -right frame.
You could in theory shoot 3K in stereo :)
Click to expand...
I think it would work.... ONLY if you had a locked off shot with no movement in frame! Not a very creative setup.
Any separation of the two images in anything other than the prescribed lateral stereo offset for perception of distance will screw your head.
So panning, or lateral or vertical movements in frame would have a different time slice for each L & R and just not work. BTW, projection for stereoscopic (in digital) of 24fps L&R material from a single projection source is 144fps (24 x L,R,L,R,L,R per second.) Use 2 x projectors and you can run 24fps L&R.

Chris
 
cws said:
I think it would work.... ONLY if you had a locked off shot with no movement in frame! Not a very creative setup.
Any separation of the two images in anything other than the prescribed lateral stereo offset for perception of distance will screw your head.
So panning, or lateral or vertical movements in frame would have a different time slice for each L & R and just not work. BTW, projection for stereoscopic (in digital) of 24fps L&R material from a single projection source is 144fps (24 x L,R,L,R,L,R per second.) Use 2 x projectors and you can run 24fps L&R.

Chris
Click to expand...

I don't quite see why that wouldn't work. Most of us are still watching interlaced TV without complaining. I know it's different... but still.
 
Split screening the Sensor 2k+2k for 3D

hi
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Alexis Vanier said:
I don't quite see why that wouldn't work. Most of us are still watching interlaced TV without complaining. I know it's different... but still.
Click to expand...

48 fps is a lower motion sampling rate than 60 Hz interlaced, so the time difference between the one eye and the other eye being one frame out of sync, motion-wise, would be even more distracting.

Also, 60i is shot and shown at 60 fields per second. If you shoot at 48 fps a second, then you'd have to project at 48 fps even if alternating frames were for each eye.

I suspect the motion artifacts of capturing each eye on alternating fields captured sequentially is somewhat distracting as well.

You kind of want a moment in time to be captured by two eyes, not one eye... then the other eye... then the first eye again, etc.

Unless this interlaced 3D format actually is just recording the simultaneous capture of the left and right eye to separate fields. But I don't see how that would happen with a single sensor unless each view only took up part of the sensor.

---

Yes, if you could get a stereo lens set-up to fit onto one RED camera, you'd want to turn the camera sideways to fit the twin images, unless you wanted two vertical aspect ratios.
 
Cinemano

I have been looking at that same Loreo thing with great interest.
Its only $100 but I have so many $100 pieces of junk around that I really didnt want to be dissapointed again (anybody want apoor man's steadicam). But in principle it should work. You wouldnt get 2 x 2k though as you would lose a fair amount of the image on the dividing line of the 2 frames.

But please keep me updated if you try this thing out.

There are some cheap softwares for encoding this video....

I forget the name -nothing a 5 minute google search wont find out though.
 
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