I purchased the wrong size, so the product is unused. There is a tear in the box from when it was opened. There may be differences in the lens diameter and the diameter of the focus ring, so I will describe the manufacturer's method for measuring the diameter of the focus ring below. Please check before purchasing. 1. Cover the entire focus gear with a piece of paper and pull both ends tightly together. 2. Mark the points where the two ends meet with a pen. Be sure to mark both ends. 3. Spread out the paper and measure the distance between the two marks in millimeters with a ruler, and divide that number by 3.14. That number will be the diameter of your lens. For example, if the two marks are 255mm apart, dividing 255mm by 3.14 gives a diameter of 81.2mm. The size of the lens's focus ring will be 81-83mm. ※The last photo is a reference image for lens installation. The lens is not included.