Select the size above - 77mm or 82mm A step ring is included with the purchase of each ExpoDisc v3. For example, when you purchase the 82mm ExpoDisc v3 it includes the 82mm Step Ring. The ExpoDisc v3 is a single size that will fit either size Step Ring. Additional step rings can be purchased for other lens sizes. At this time we have a 77mm and 82mm Step Ring available. Do I need a step ring? No. You can skip using a step down ring all together and hold the ExpoDisc over your smaller lens. The ExpoDisc v3 has a diameter of 86mm and can simply be held over lenses that take 82mm or smaller size filters. I have a 95mm lens? The ExpoDisc v3 features a new mount design that incorporates a bayonet mount feature that quickly attaches to a step ring that you thread onto your lens. If you have a 95mm lens, then we recommend pairing the ExpoDisc v3 82mm with a 95 to 82mm step down ring. The ExpoDisc v3 82mm Step Ring can then be threaded onto the 95/82mm step down ring attached to your lens. I have a 72mm lens or smaller and want to attach the ExpoDisc to my lens? We currently offer the ExpoDisc v3 step ring in a 77mm and 82mm size. If you have a 72mm lens or smaller, and you would like to attach the ExpoDisc v3 to your lens, then we recommend pairing the ExpoDisc v3 77mm with a step down ring. For instance, if you have a 67mm lens, then the ExpoDisc v3 77mm step ring will attach to a 77/67mm step down ring attached to your lens. Inexpensive step down rings can be found at your local camera dealer or online.
