I am selling these WB lens caps because of no using them. These are in excellent condition, showing almost no signs of ever been used. White Balance Lens Cap allows photographers to create an average white balance for a particular scene by placing the cap on the lens and relying on the diffused light. The cap easily slips onto the front of your lens. An included adapter allows you to use the cap with a bayonet mount. - Averages Color Temperature of All Light In a Given Scene - Provides Accurate White Balance Measurement - Works with Any Digital Camera that has Manual White Balance Feature - Slips onto Front of Any 67mm Lens - Adapter Allows Use with Bayonet Threads