They've got Adapters. 😇
Early SLR Magic Anamorphot 50 1.33x, happily married to the Canon 40mm pancake, a widescreen dream and it won't get any wider on a full frame sensor anyway. Pure anamorphic madness - including those vicious, blue-ish SciFi streaks once you shoot into light sources, complete with a slight outward bending towards the edges.
No trickery in post. You can take it "as is" - just fix the aspect ratio and you're done. 😇
Won't match well with most lenses, though.
You're limited to m4/3, but compared to *anything* else it always was a steal ever since they released those delicious little monsters. Beyond that we're talking Hawk & friends, with price tags of a mid sized sedan each.
Having said that - if you want widescreen, the combo I've got is amazing. Surprisingly sharp. The simple pancake design might be the only one giving you that goodness, though, so you're limited, but for wide shots, it's doing an amazing job. 🥰
https://www.youtube.com/watch?v=1Fy-cputegA
Well - you've got a sample and I don't think adapters are as shoddy as claimed, but even the adapter I got clearly was designed with m3/4 in mind. My use case is more like the exception rather than the rule and pretty much the limit already, as dark corners start creeping in with 35mm lenses.
To put it into perspective: You can get right in front of any stage and still get the *entire* stage into the frame. For concerts, it's pretty cool. And surely for anything begging to be *wide*.
Dirk Ritter