Lens extension and retraction. Aperture blade opening and closing operation. The above have been confirmed. I don't think there is any mold on the lens. It appears to be a beautiful item with little signs of use. ※ Please note that this is a used item, and I do not possess the specialized knowledge of a camera store, so there may be oversights. Please assume that anything not mentioned has not been confirmed. We cannot provide support or warranty for any changes in condition or malfunctions after receipt. Please only purchase if you can agree to this. As this is a used item, returns are not accepted.