Opteka / Vivitar 420-800mm f/8.3-16 HD Telephoto Zoom Lens

This is a manual focus telephoto zoom lens with a focal length range of 420-800mm and a maximum variable aperture of f/8.3 to f/16. The item is finished in a matte black metal barrel with a large, textured rubber focusing ring. Notable markings on the front bezel include '420-800mm', '1:8.3-16', 'ø62mm' indicating the filter thread size, and a 'MADE IN JAPAN' stamp. Physically, the lens features a long, cylindrical construction utilizing a T-mount system at the rear for compatibility with various camera bodies via adapters. The front element appears large and clear, though the inner barrel shows minor dust accumulation. Condition-wise, the external body exhibits light cosmetic wear, particularly along the silver accent rings and the edge of the built-in lens hood. The rubber grip remains intact but shows signs of handling. This specific style of lens is a modern, budget-oriented design frequently rebranded under labels such as Opteka, Vivitar, or JZS. It is characterized by its simple optical formula and linear slide-zoom mechanism, representing a utilitarian approach to long-range wildlife or astronomical photography.