AVS Forum Addicted Member
Join Date: Jul 2002
Location: Planet Boston, source of the spice, Melange.
Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
Quoted: 4127 Post(s)
Native resolution for Ultra HD home video is 3840x2160, which measures a 1.78:1 aspect ratio. If you scale a letterboxed image vertically to fill the whole panel and then add a 1.33x lens, you get a 2.37:1 image, which is visibly close enough to either 2.35:1 or 2.40:1 that you won't notice the difference.
JVC and Sony 4k projectors have a 4096x2160 pixel panel, which measures 1.89:1. I'm not sure about Sony, but JVC at least offers two different viewing options. You can choose to watch the content at its native 3840x2160. This will leave you with pillarbox bars on the sides that you can let spill off your screen. This is a good match for a 1.33x lens.
Or you can zoom the image up to use the full 4096x2160, cropping some pixels off the top and bottom. If you add a 1.33x lens to the this, the image will be stretched to 2.52:1, which is very likely to have visible geometric distortion. What you actually need for this scenario is a 1.25x lens, such as the Panamorph Paladin DCR. Unfortunately, that's very expensive.
If you already have an existing 1.33x lens and want to add it to a Sony or JVC projector, it's best to set the projector for 3840x2160 viewing.
Home Theater Writer/Editor, High-Def Digest
My opinions are my own, and do not necessarily reflect those of my employers.