What are the choices for anamorphic adaptors on these cameras?

Thinking about it if you squeeze horizontally optically then in post you scale vertically to fit (1920 x 820) you would help with the vertical line skipping aliasing a bit. Horizontally the resolution is much better.

Plus the adaptor would also soften the image, a dual function :)

I can find information about the iscorama lenses (not that i can find any to buy or at least see the price) and mention of various adaptors. But i wonder if this is a product area that may gain more options now.

makes me wonder how difficult building one would be?

cheers
paul