Such an interesting podcast! It was the geekiest ever and I loved it! I learned very much. I was surprised to find out that a curved silver screen can eliminate hot-spotting with 2D material. Im really looking forward to your take on the D-73d. I bet it will be incredible.

About the part where you guys were talking about the % of light lost at the polarizer, then at the glasses.

You lose 20% at the polarizer, then another 20% at the glasses. However, the 2nd 20% is only 20% of the 80% coming thru the polarizer.

100 x .80 = 80 --> 80 x .80 = 64

So, not 70%, like Bob was saying, but not 60% either.

Jim, the Dolby system indeed triple flashes each frame when in 3D mode for a combine 144Hz display. However, when the projector is switched to 2D it will refresh at 24Hz. 144Hz is needed to prevent flicker since each eye view is seen only 50% of the time. In 2D, both eyes see a continuous view, and the projector can match the content's original frame rate. At 24Hz the brightness is higher and the bit depth available to the DLP system is higher.

Your math is correct. I did the calculation quickly in my head and came up with 67% (70% when you round it), but you are right.

Bob:
Listened to an excellent podcast with Scott Wilkinson and you talking about your latest projection project. Your discussion was fill with interesting and valuable information.

There was a section of you saying digital projection, 3D, is shot to the screen in 24 frames per second. I wonder about that. I am a projectionist who had a great hand in installing a Dolby DLP projector and we were/are under impression that, yes, 24 fps but the

The problem with old film projectors was that they only could show you an image half of the time, and the other half of the time you would be shown black.

It