Adaptable Connection: Flexible cable for easy maneuvering Dual Mount Functionality: Easily switch between reverse and positive lens mounting for macro photography Electronic Contact Integration: Transfers exposure data seamlessly Automatic Functionality: No manual setting required for all automatic features Usage: Insert between lens and SLR camera body This is a subscription-based item. Proceeding means you accept the cancellation policy and allow us to charge your payment method as listed until your order is complete or you cancel, if allowed.