If you own a Panasonic GH3 / GH4 (or other M43 camera) then you'll find that the the Panasonic 7-14mm Wide Angle Lens is a must have for ultra wide views with minimal barrel distortion. You'll often see my gimbal reviews setup with the GH4 and the 7-14mm as this is one of my favorite lightweight camera setups to run around with.
But in bright outdoor situations you don't easily have the option of adding a proper CPL Polarizer or ND Filter to maintain proper shutter speeds while shooting video. Perhaps you'll need a very dark ND Filter for long exposure images or to add motion blur during timelapse images. Or maybe you're thinking about adding a basic UV (clear) filter to protect the front lens element during a car mount, or sports that could kick debris towards your lens causing chips and scratches.
There's a number of good reasons why you'll want to add filters to the Panasonic 7-14mm lens, and so you'll want to check out this PVGear threaded filter holder. It's made of a durable plastic, but has a metal threaded ring to mount your filter. It merely clamps to the hood, so you don't need any tools to get it on or off. If you're a fan of this lens like I am, you can find more information about the Panasonic 7-14mm Filter Adapter over on the product page (click here).
And if you're like me, I like to keep the Variable ND Filter slim while still on a budget. A great option is the Fotga 86mm Slim VND (found here).