PROMETHEUS – 3D shooting and posting

[Captain_Celluloid]

I’ve read that PROMETHEUS live action was shot with PARALLEL CAMERAS and converged
in post. I assumed that meant shooting without a beam splitter . . . however,
production photos in your article clearly show a top vertical mounted camera
and a beam splitter.

Does anyone know anything more on this? I have to wonder for what reason would a beam splitter be used with parallel cameras — perhaps to achieve a smaller IO distance?

The film was almost totally free from ghosting and “floating highlights.”
I had thought this was due to NOT having used beam splitter.

If they used beam splitter AND got rid of ghosting I am even more impressed
with the post 3D work.

thanks,

-30-

[Anonymous]

This is not the case.
The term parallel in Stereo does not mean the cameras are side by side.
The reason you still use a beam splitter is to get an smaller interaxial than the lens and camera bodies would allow.
normally an axial would be the width of your eyes or seriously smaller… there are exceptions (I imagine they did wider on the cloud footage over iceland …) but generally it is smaller than the camera body/lenses would allow. The calculation for this is quite complex and not as simple as your might guess – it relates to expected projection size, etc …

Mike

[Anonymous]

@mseymour7 40165 wrote:

This is not the case.
The term parallel in Stereo does not mean the cameras are side by side.
The reason you still use a beam splitter is to get an smaller interaxial than the lens and camera bodies would allow.
normally an axial would be the width of your eyes or seriously smaller… there are exceptions (I imagine they did wider on the cloud footage over iceland …) but generally it is smaller than the camera body/lenses would allow. The calculation for this is quite complex and not as simple as your might guess – it relates to expected projection size, etc …

Mike

Thanks,

I thought it was something complicated; does PARALLEL simply mean they don’t shift convergence on the shoot?
and do it all in post?

At any rate PROMETHEUS looked great and had very little ghosting.

Any thoughts on how that was achieved.

Thanx.

A 2D – DOP Trying To Cope with 3D

[Author]

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