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Author Topic: IMAX3D
John Wilson
Film God

Posts: 5435
From: Sydney, Australia.
Registered: Dec 1999


 - posted 08-08-1999 05:06 AM      Profile for John Wilson   Email John Wilson   Send New Private Message       Edit/Delete Post 
Does anyone know why a 3D IMAX film is printed to run emulsion out while a 2D print is set to run emulsion in? I'm sure there is a valid reason, but I would like to know what that is.

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John

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Gordon McLeod
Film God

Posts: 9431
From: Toronto Ontario Canada
Registered: Jun 99


 - posted 08-08-1999 12:09 PM      Profile for Gordon McLeod   Email Gordon McLeod   Send New Private Message       Edit/Delete Post 
Only one eye is printed emulsion towards the lens the other is printed emulsion towards the lamp as normal
This is because depending on the 3d rig used one camera is faced into a mirror as such the image is backwards on the negative
Since in a printer emuslsion must
always face emulsion one eye is oriented backwards and as such runs the oposite way throough the
projector. The old interlock 35mm 3D was the same

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John Wilson
Film God

Posts: 5435
From: Sydney, Australia.
Registered: Dec 1999


 - posted 08-09-1999 01:29 AM      Profile for John Wilson   Email John Wilson   Send New Private Message       Edit/Delete Post 
Yes, that used to be the case. Now they are both printed the same way, that is...emulsion out. The question is... can't they be printed emulsion in?

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Gordon McLeod
Film God

Posts: 9431
From: Toronto Ontario Canada
Registered: Jun 99


 - posted 08-09-1999 09:46 AM      Profile for Gordon McLeod   Email Gordon McLeod   Send New Private Message       Edit/Delete Post 
Twin camera/projector cannot be printed the same way without making an internegative for the one eye that was photgraphed reversed.
70mm inc will not make any extra internegs in fact prints are usually made right off the camera neg.
So therefore one eye will run emulsion towards the lens

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000


 - posted 08-09-1999 02:30 PM      Profile for John Pytlak   Author's Homepage   Email John Pytlak   Send New Private Message       Edit/Delete Post 
Some of the 3D cameras use a mirror for each eye to have the proper intraocular distance. Prints from these 3D negs have an orientation of base side toward the rotor, rather than the normal emulsion-to-rotor orientation of a 2D print.

Contact prints are always made emulsion-to-emulsion --- they can be printed through the base to reverse orientation, but at a cost of sharpness. Optical printing could be used to flip the orientation, but at much higher cost.

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John Pytlak

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