This Tamron SP lens is a high-quality, manual focus lens with a maximum aperture of f/5.6. It has a focal length of 300mm and is designed for use with adaptall 2 mounts. The lens is produced by Tamron and is part of the Tamron SP series.

It's a great choice for anyone looking to take high-quality photos with exceptional clarity and detail. This lens is perfect for photography enthusiasts who are looking for a reliable and efficient lens to add to their collection.