I’ve been playing with an SLR Magic Anamorphot. This is a high quality lens adapter that allows you to shoot in the 2.35:1 aspect ratio with a conventional 16:9 camera. The adapter screws on to the front of existing lenses and squashes the scene horizontally by 33% as you shoot. Then in post you squash the image vertically by the same amount and the end result is 2.35:1 aspect ratio footage.
There are some limitations and these are covered in the video, so please watch the video for a full explanation as well as some sample footage. For the money it’s a great way to get low cost anamorphic shots. As well as the aspect ratio change you get really nice horizontal blue lens flares giving you that JJ Abrams look to your productions. Really looking forward to trying it on my A7S once that arrives.