Screw-on "bayonet" mount... does this exist?

[mcbob]

...because if it doesn't I'm going to produce one for sale and make tens and tens of dollars.

I've been using some high-quality wide-angle adapters while shooting, and am tired of screwing and unscrewing the thing. Surely somebody along the way thought to produce a two-piece schmegegedy that allows a fellow to easily latch and unlatch such a bit of glass (or, say, a vari-ND or CPOL or the like) with relative ease, in 77 and 58mm flavors?

I've seen a magnetic such device, which sadly wouldn't be robust enough for wide angle converters.

Thoughts? Thanks.

 

[Samuel H]

I've thought a lot about this too (I use screw-in ND filters, and it's painful, but I don't want the price and size of a matte-box solution)
it's not easy: if you build any kind of cage to hold traditional screw-in filters, you have to leave a lot of empty space between one filter and the next, to have the male and female screws separated
the closest thing I know about is cokin-P, but it's not perfect either, and resin filters can be pretty awful