TTArtisan 100mm f/2.8 lens and M42-E adapter set from Meisho Optics. Dust is minimal, allowing for clean photos. The mount adapter was prepared for test shooting and is almost new. Main specifications and features are as follows: This is a medium telephoto manual focus lens characterized by its unique "bubble bokeh" rendering. It renders point light sources in the background as bokeh with soap bubble-like outlines. It uses an M42 screw mount, and can be used with various cameras via a mount adapter. It has a very compact and lightweight metal body (approx. 310g). - Brand: K&F CONCEPT - Model: M42-E - Type: Lens Adapter - Brand: Tartisan - Focal Length: 100mm - Maximum Aperture: f/2.8 [Other] We have inspected and photographed the item, but there may be oversights. Please check the photos provided and purchase only if you are satisfied. Please refrain from purchasing if you are concerned about fine dust particles inside the lens. Feel free to comment if you would like additional photos. The item includes what is shown in the images. Returns are not accepted to prevent product substitution. This is a used item, so please refrain from purchasing if you are looking for perfection or are overly sensitive. Thank you for viewing.