500mm f8-f32 Manual Telephoto Long Lens T Mount for DSLR Features: Connect the camera and lens with the ring, set the camera panel on M manual No show of aperture unless from shutter speed or ISO to change the exposure, some cameras can achieve automatic exposure The tripod is necessary (not included), the lens has a tripod ring to directly connect the tripod, pay attention not to connect the tripod with the camera Manual adjustment, full metal structure, optical glass multi-layer MC coating It possesses 420mm-480mm super long variable focal length ideal to watch birds and wildlife. It offers a T mount accessible to various rings and suitable to various DSLRs. Instructions: Manual lens with no electric button included. It can be connected on various DSLRs with different rings, supporting silent frame and ILDCs. Specifications: Lens construction: 4 elements in 4 groups Focal length: 500mm Shortest focusing length: 10m Aperture: F8.0 to F32 Front filter diameter: 67mm Dimensions: 70mm*298mm Weight: 640g Color: Black Material: aluminum magnesium alloy, optical glass key word: long lens, telephoto lens, T mount, lens, DSLR aluminum magnesium alloy, optical glass