Film-Tech Forum ARCHIVE: dark time & output delay time ??

This is topic dark time & output delay time ?? in forum Digital Cinema Forum at Film-Tech Forum ARCHIVE.

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Posted by David Torres (Member # 6353) on 06-22-2011, 12:21 PM:

What are these parameters of projector setting?

For active 3D, like XpanD, are these settings different for double flash and triple flash? Any recommended best settings... [Confused]

-David

Posted by Frederick Lanoy (Member # 5416) on 06-22-2011, 02:40 PM:

Hello,

For Xpand :

Dark Time : 1000 for Triple Flash / 500 for Double Flash.
Output Reference Delay : - 700 for Triple Flash / - 300 for Double Flash.

These are the values from Xpand company. Therefore, it's the best setting.

Fred.

Posted by David Torres (Member # 6353) on 07-14-2011, 01:25 PM:

Thank you.

It works fine with the settings. [Smile]

Posted by Steve Guttag (Member # 268) on 07-16-2011, 07:41 AM:

Think of the dark time as a shutter blade...how long is the projector projecting NOTHING. Think of the "delay" as the shutter timing.

With the single lens 3D systems, you need to keep the wrong eye from being projected when the glasses/wheel/polarizer is set for the "other" eye. It takes a finite amount of time for these apparatuses to switch eyes so just like when film advances with an intermittent, so too do the two eyes with 3D.

Using a suitable test pattern, one can often tweak these settings to get a brighter more ghost free image (like an adjustable shutter blade that you can not only adjust its timing but also how tall the blades are). Remember, it is better to have less ghosting then trying to get that last ray of light. The "factory" suggested settings have always "worked" for me for the various 3Ds. That said, in some hard-case situations, I've been able to eek out more light without negative results by hand tweaking the dark/delay settings.

-Steve