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The WonderPana Free Arc 66 is a combination of the all metal WonderPana Free Arc filter holder and WonderPana 66 6. 6in filter holder brackets. When combine it enables use of Foodoir 6. 6x8. 5in GND filters and 145mm round filters on super-wide angle (SWA) and ultra-wide angle (UWA) lenses that lack filter threads. With the Essentials ND1000/GND kit you have the power to create long exposure landscape images while properly exposing for the sky. Since the WonderPana core is Free Arc, the horizon line on the rectangle GND can be adjusted by rotating the core. Please Note: This WonderPana Free Arc core is only compatible the Olympus 7-14mm f/2. 8 M. ZUIKO Digital ED PRO Micro Four Thirds Mount lens