bmpcc6k wrote:Can someone show by photos or videos difference between 1.8x and 2x or between all squeezing formats?
Squeeze usually can be one of 1.3x or 1.33x or 1.5x or 1.8x or 2x.
What the final image will look like at least in terms of resolution would normally be one of the standard deliverable projection resolutions with or without letterboxing.
The capture (recording) resolution can depend upon the aspect ratio with which you have active photosites.
To illustrate, many modern cameras offer a 4:3 active sensor crop which you would use with a 2x anamorphic lens or anamorphic adapter.
BMD cameras generally have a full sensor in 16:9 aspect ratio which is ideal for use with 1.33x anamorphics. The cameras may also offer additional sensor crops to support 2x anamorphics or smaller capture resolutions for HD.
Standard deliverables for theatrical projection are typically 2K or 4K with letterboxing.
To keep it simple, let’s consider a sensor like the 4096x2160 DCI 4K on the BMPCC4K. If you want to use 1.33x squeeze, it’s economical to select the 3840x2160 UHD crop (16:9 aspect ratio) as the capture resolution. The squeeze of the x-axis means everything will look skinny until you desqueeze in post (and desqueeze in your camera monitor). When you desqueeze you’re making the pixels square again. So your intermediate resolution in post might be 3840x1624. You can downscale this in post to 2048x866 but then crop a few rows to produced DCI 2K 2048x858 for theatrical projection with 2.39:1 aspect ratio.
If you want to begin with 4:3 sensor crop and use a 2x squeeze you can get to DCI 2K at the cost of not using all of the captured resolution. 2x desqueeze results in a 8:3 aspect ratio or 2.66:1 to get to a standard DCI 2K.
If you are not producing for a theatrical projection but only for the web and viewing on a computer, you can use whatever aspect ratio you like for your images but letterboxing will likely be applied according to the site you use such as Vimeo or YouTube.
If all can sound confusing but once you have captured the squeezed footage, seeing the desqueezed images makes it fairly straightforward.