Check out this Prismasonic anamorphic lens that an incredibly kind stranger gave me. It has a motorized stretch built-in:
It's so cool. It comes with this remote which lets you leave it in place. Press pass and light passes through unstretched. Press stretch and the screen gets wider and stops when 16:9 becomes 2.40:1.
It has a built-in stand too, so if you shelf mount your projector like me, then no extra hardware is needed to start using it.
I'm not sure if this is an intended official feature but if you take your finger off the stretch button early, you can achieve other aspect ratios like Netflix's fav 2:1. I just need to figure out a convenient way to add other vertical stretch modes on my projector...
It's a shame the optics aren't as good as my Panamorph compression lens because the design and build quality is awesome. It solves one of my biggest issues with anamorphic lenses - i.e. that there is a lot more than just two aspect ratios used in movies and TV shows. The motorized variable stretch solved that. At least it would if I had separate 1.85:1, 2:1, 2.35:1 and 2.4:1 stretch modes on my projector. It works for 4k projectors like Sony and JVCs which need 1.25x stretch instead of 1.33x too.
It's also nice to not need to spend extra on a motorized sled. It's a much better low cost solution than Panamorph's "just leave it in place and use 4:3 for 16:9 content" imo. I like new toy!