This! A polarizer is needed for ultra wide work to knock down reflections in water, plus ND's and grad ND's are awesome for landscapes and waterfalls. Long before I got into Sony I bought into the Olympus M/43 system in 2012 and they have a beautiful sharp 7-14 f2.8 Pro zoom lens (14-28 ff equivalent) that does not have filter threads either. I bought a Haida 100mm slide-in system with a special press on donut connector with mounting ring, the filter holder, a couple of graduated ND's, 3 and 10 stop ND, a polarizer and adapter rings so it could mount onto other Olympus lenses. Total cost was a little over $650 and that was for a 100mm filters system. Nisi makes a 150mm slide in filter system for the Sony 12-24GM and just for the holder and CPL is it $520 USD, the added filters are about $100 each and up so you could be near $1,000 for a complete kit. Plus a 150mm filter system is HUGE, half again as wide as the 100mm system I have, which is not small itself. Many time I left the 7-14 with filter system at home as it takes up a lot of space and I end up buying a Laowa 7.5mm f2 MF lens (15mm FF) that took standard 46mm filters.A screw CPL filter is always fixed to my UWAs and I'm happy to pay the price of a slower lens for this.