desqueeze anamorphic footage

[Chris Wright]

Select them in the bin, right click and choose Modify>Interpret footage.

quote is from arri rep.

2944×2160 is a ProRes format with black padding left/right, the active image is 2880×2160.
Did you shoot with anamorphic lenses all the time?

Currently there are two way depending on your lens choice:
a) 4:3 2.8K with anamorphic lenses
– set your project resolution to 2048×858
– set Input scaling preset to “Scale full frame with crop”

Since the 4:3 is way too wide for 2.39 we need to do two things: crop & scale.
for the 4:3 2.8K shot set sizing “Zoom” to 1.142 (2944/2578) and “Height” to 0.5 to squeeze the image.
Now you can edit your 2048×858 next to this shots.

b) 4:3 2.8K with spherical lenses
(you will loose image information since the image is 1.8x the height of your timeline (2048×858)
– set you project resolution to 2048×858
– set Input scaling preset to “Scale entire image to fit”

Now we need to re-fit the image
for the 4:3 2.8K shot set sizing “Zoom” to 1.79 (858/2160*2880=1144; 2048/1144= 1.79)
By adjusting you can reframe on the vertical axis (entered value is pixels).
Again, you can edit your 2048×858 next to this shots.

The supported workflow allows attachment of Proxies with other frame sizes & PAR (pixel aspect ratio) combinations that are divisible by the Full Res clip (for example, 1920×1080 1.0 PAR Full Res and 960×540 1.0 PAR Proxy or 1440×1080 1.33 PAR Proxy), but other parameters such as fielding, frame rate, duration, and audio channels must match. Mismatched audio channels results in warning dialogs and are not allowed.

https://helpx.adobe.com/premiere-pro/kb/ingest-proxy-workflow-premiere-pro-cc-2015.html

good walk through
https://blog.frame.io/2017/03/20/premiere-pro-proxies/