I'm looking at shooting some projects in 4:3 anamorphic on my GH5. Does anyone have any experience shooting anamorphic with the Aivascope 1.75x anamorphic adapter? I like how the 1.75x will get the closest to 4K DCI Scope 2.39, which is where I want to end up with my projects. I'm wondering if it will work with the Rokinon Cine DS primes and maybe even the Sigma 18-35 Art (doubtful, I know) and 50-100 Art zooms. The Rokinon Cine DS all have 77mm front threads and the Sigmas are 72mm and 82mm. Would step-down rings work? Also, would the Speedbooster Ultra 0.71x work with that combo, or would I need to get a non-focal reducing lens adapter?