Originally Posted by typecase
Can someone help me understand this. If all 4K BD content is natively 16:9, then what's the point of a native 17:9 chip. Also, how do you use a 1.25:1 anamorphic lens on this 16:9 content without getting the wrong aspect ratio.? Finally, if I upgrade to a Sony projector with this weird aspect ratio, are there any drawbacks to using a 1.33 anamorphic lens?
1K is the same as a bite or 1024, so everytime we have number "XK", it is a multiple of 1024.
2K = 2048
4K = 4096
4 x 3 formats like DVD were based on 720 x 540 and DVD had non square pixels to work with PAL and NTSC.
1080 is twice that of SD or 2x 540.
UHD 2160 is twice that of HD or 2x 1080.
4096 / 2160 = 1.9 not 1.78, so true 2K and 4K systems are 17:9, not 16:9.
16:9 was a compromise that supposed to represent a half way way point between 4 x 3 and Scope. Personally, I think 1.9 or even 2.0 would have been better.
The anamorphic lens allows us to use the full panel. Therefore for systems based on 1.33 like 16:9, a 1.33x lens is needed. in a 2K/4K system, a 1.25x lens is required.
The SONY projectors offer a 16:9 mode, so they back off the panel at the 1.78:1 limits. A 1.33x lens works with these systems. I have done this with one of my lenses and the SONY 520.