lens works great. The soft membrane clicks. Smooth movement to focus as well as possible. However, this seller did not include a lens case as listed and shown. Big failure. I got all three focal lengths from this manufacturer for my Panasonic cameras. All perform very well. Only two out of three did not include a lens case and are unresponsive. The lens is a review and not a lack of customer support or an omission of what I paid for. I was distracted. The lens is excellent. The company sucks.