Originally Posted by jabz
Hi, I don't get this and I have seen it a number of times, I'm sure its due to my limited understanding however would appreciate someone explain it. I have a Prismasonic Cylindrical lens, which I am using with my Sony 520ES 4K Projector. How is my lens not using the full 4096 x 2160 panel vs a DCR lens which claims to?
The way i try to understand the meaning of that 6% is.... that there is ~6% more light and resolution is the difference between the use of the full 4096 vs only the 3820 horizontal resolution when using these native 4K projectors.
Most A-lenses have the 1.33x horizontal stretch or similar 1/1.33 > ~0.75 squeeze ratio to be used with 16:9 AR projectors @ native 3820x2160 source resolutions.
To get the correct aspect ratio when using the projectors full native 4096 x 2160 resolution that is wider than the 16:9 format, the A-lens need to only have 1.25x stretch or 1/1.25 > 0.8 squeeze.
There may also be some different in light output when using an A-lens that squeeze the height of the picture vs a stretch lens. Particularly when the projector is used at the same throw distance from the screen. The reason is that with a squeeze A-lens, the projector lens is uses more in the wide angel part of the zoom that often have a higher light output from the same throw vs the the less zoomed projector lens, used together with a horizontal stretch A-lens.
If your Prismasonic Cylindrical lens have the 1.25x stretch factor so your Sony can use the full native resolution and get the correct AR on the screen, then you already have that positive 6% light and resolution.
Edit: looks like I was a little late with this reply....