This is topic IMAX3D in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by John Wilson (Member # 269) on 08-08-1999, 05:06 AM:
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.------------------
John
Posted by Gordon McLeod (Member # 33) on 08-08-1999, 12:09 PM:
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
Posted by John Wilson (Member # 269) on 08-09-1999, 01:29 AM:
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?
Posted by Gordon McLeod (Member # 33) on 08-09-1999, 09:46 AM:
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
Posted by John Pytlak (Member # 331) on 08-09-1999, 02:30 PM:
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