Okok, I received some step up / down rings yesterday.
Taking lenses for my Pocket 4K with the Elmoscope type 1 I used were 35mm T2.2 Meike cine lens and a Canon FD 50mm 1.8.
Using the anamorphic mode for the BMPCC4K I got decent results: the 35mm is slightly vignetting (not a hard vignette, just a little Grey corners), so I actually like it the way it is. Cropping in, it's more than usable.
The 50mm is giving me a headache, because the adapter (FD to Mft) is moving and I don't have a lens support yet. Still the overall cheapest solution if you want to get into anamorphic.
There isn't much coating, Direct light from the front lights up a huge horizontal oval Grey (especially with the 35), making the picture totally Grey in the corners, lens flares are warm blue.
If someone finds this thread here is a list :
20€ step up rings
270€ elmoscope type 1 incl redstan Adapter
20€ lens support
550€ fvd 16 (or any other diopter that fits on sankor 16d too)
(things I already had
(50€ 50mm taking lens
15€ taking lens adapter
5€ some aluminum rods off the shelf
40€ baseplate
))