The Tamron SP 90mm Adaptall 2 f/3.5 - 3.8 Tele Macro Lens is a high-quality lens designed for Olympus cameras that offers a maximum aperture of f/4.5. With a focal length of 90mm, this lens is ideal for capturing detailed close-up images with its tele macro capabilities. The Adaptall 2 mount allows for compatibility with a range of camera brands, making it a versatile choice for photographers looking to explore macro photography with precision and clarity.