Lens extension and retraction. Aperture blade opening and closing. The above have been confirmed. There is dust on the lens, but I don't think there is any mold. There is a crack in the selector lever, but it does not affect the operation. ※ Please note that this is a used item, and I do not have the specialized knowledge of a camera store, so there may be oversights. Please assume that anything not mentioned has not been checked. We cannot provide support or warranty for any changes in condition or malfunctions after receipt. Please purchase only if you can agree to this. Please refrain from returns as this is a used item.