Jurek sent me this::
Had the opportunity to play with one of SLR Magic’s new Anamorphic lenses for a few hours last Saturday. Usually 1.33x lenses are recorded to a 16:9 aspect ratio to get the Cinemascope look after de-squeezing. This time Andrew Chan of SLR Magic suggested we try recording to the 4:3 ratio normally reserved for 2x lenses.
The result is a 16:9 image (when de-squeezed) but with an anamorphic look. Really nice glass.
Panasonic GH4 set to 4/3 mode with an SLR Magic 35mm T2.4 Anamorphic lens, captured in 4K UHD with V-Log L profile in 10-bit, 4:2:2 to an Atomos Ninja Assassin. Also used, Movcam wireless follow focus and Westcott Flex LED lights.