NiSi JetMag Pro MAXMAG Magnetic Filter Adapter for the Olympus 7-14mm f/2.8 PRO
The Olympus 7-14mm f/2.8 PRO has a bulbous front element and no filter thread, so normally you have no way to attach filters to it. With this NiSi filter adapter, you can. You clamp it around the lens barrel with a precision ring, and the front carries NiSi's magnetic MAXMAG system. From there, you click filters into place in a single motion and remove them just as fast.
The adapter is machined from a single piece of aluminium and has a contact surface lined with Alcantara, so it holds firmly onto the lens barrel without damaging it. You can stack two MAXMAG filters at once without any vignetting appearing in the frame, even fully zoomed out at 7mm.