The Laowa 1.33x Rear Anamorphic Adapter is different from a more “traditional” front anamorphic adapter like the ones from SLR Magic for example. With the Laowa rear anamorphic adapter, you will get less “streak” lens flares, and the bokeh will also be less oval-shaped. Also, there will be a half stop light loss when using it.
This anamorphic adapter is made specifically for the Laowa OOOM 25-100mm T/2.9 Cine Zoom lens, but it can be, in theory, be used with every glass. The unit you can see is a PL to PL adapter, but Laowa also plans to release a Canon EF to the Canon EF version.