Well, obviously large format cameras are nothing new. The point here is: for these kind of apertures and wide angles we need a super large area to expose, and usually either (a) they're smaller with digital cameras, or (b) they use film and thus cannot record videos. This is specifically the approach that uses a depth of field adapter to be able to record videos on these, which is also not new (I provided references at the end of the article), but it is quite rare! Also, each design of there depth of field adapters is quite different and I think it's interesting to see the differences between them all.