F/8.3-16 aperture at 420-800mm focal length, to separately control the super focal zoom from cameras.
T-Mount Lens to AI-mount: T mount lens with adapter ring, replacement for T/T2 lenses to Nikon AI-mount D50 D90 D5100 D7000 D3 D5100 D3100 D3000 D60 cameras.
Functional Structure: The lens consists of 4 elements in 2 groups, with lock to fix the lens for precise shoot. Whole metal structured body provides with tough and durable constructions.
Ultra Multi Coating: Adopts multi-coated technology to reduce flare and ghost to get vivid color and clear images. Premium optical glass lens provides high light transmittance.
Universal 1/4 Mounting: The base with 1/4 screw thread down the lens makes wide application on tripod and monopod, the base with ring can rotate, convenient to install in seconds.

Specifications:
Color: Black/ White(optional)
Material: Metal
Mount: T2 mount
Adapter Ring Mount: T2-AI
Replacement for: Nikon AI-mount D50 D90 D5100 D7000 D3 D5100 D3100 D3000 D60 cameras
Focal Length: 420-800mm zoom lens
Aperture: f/8.3@420mm-f/16@800mm
Optical Constructions: 4 elements in 2 groups
Zoom System: Linear push-pull
Exposure: Automatic exposure is available in Aperture Priority mode only for cameras with TTL metering systems; Other camera must be set in full manual
Focusing: Manual helical(rotary) operation(Not AF compatible)
Minimum Focusing Distance: 1.6 meters(5.25ft) from front lens element
Filter Size: 62mm
Diameter: 69mm
Length: 24-35cm / 9.45-13.38in(with caps)
Lens Dimension: 24 * 7 * 7cm / 9.45 * 2.76 * 2.76in
Adapter Ring Dimension: 6 * 6 * 1.3cm / 2.36 * 2.36 * 0.51in
Weight: 659g / 18.3oz

Packing List:
1 * MF Super Telephoto Zoom Lens
1 * T2-AI Adapter Ring
1 * Front Cap
1 * Rear Cap
1 * Carrying Pouch