Focus System: Front focus SAM (Smooth AF motor)</br>Minimum Focus Distance: 0.4ft (0.13m)</br>Filter Diameter: 49mm</br>Aperture (Max.): f/2.8</br>Aperture (Min.): f/22</br></br>Product Description</br></br><br />Get incredibly close to small subjects. Ideal for close-up and portrait shots, the <strong>30mm f/2.8 Lens</strong> allows you to focus on close-up objects with 1:1 life-size imaging. In addition to a built-in Smooth Autofocus motor, this macro lens makes it easy to transform the everyday details of life into photographic works of art.</br><br/>http://www.amazon.com/gp/product/B002MPPRNQ