GH5 has a unique features to work with anamorphic lenses. In particular ones that have a 2x squeeze this means that they're gonna squeeze everything twice as narrow and make it what twice as tall than it is in reality
Concerning the use of the GH5, a number of detailed explanations by Technical Support Representatives of Panasonic are compiled into video clips.
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All GH5 Tutorials
• LUMIX Academy | GH5 Tutorial