The Quantum QFlash Clear UV Filter Kit (QF65) is an accessory kit for the Quantum Q Flash System. The kit consists of a black retaining ring & two Quantum standard UV (Ultraviolet) Absorption Panels. To use, remove the clear protective film from both filters. For special colour lighting effects, a coloured gel can be added. The optional QF66 accessory is an assortment of 7 coloured gels pre-cut to fit the Qflash. To add a coloured gel, remove the two filter disks from the retaining ring. Insert a pre-cut gel between the disks or cut a coloured gel (not supplied) the same size as the filter disks. Insert the disk assembly inside the retaining ring. Snap the diffuser onto the reflector.