Feature: 1. Wide Range of Uses: Lens itself is T2 mount, which can be installed on a telescope for observing the moon, etc. 2. UV Filter: Can weaken the blue tint caused by ultraviolet rays and help to increase the clarity and color reproduction. 3. With Standard Adapter Ring: Can be installed on the OM mount SLR camera for shooting long distance objects. 4. 420‑800MM Ultra Telephoto Zoom: Telephoto lens is conducive to shooting distant scenery, wild animals, concerts, bird watching, etc. 5. F8.3‑16 Super Telephoto Lens: Aluminum alloy body, exquisite texture, compact shape design, easy to carry, fixed tripod ring. 6. Applicable Models: Specially designed for Pentax PK mount camera. Manual adjustment, all metal structure, optical glass multilayer MC coating. Specification: Item Type: F8.3-16 Super Telephoto Lens Color: As Pictures Shown Material: Alloy + Optical Glass Weight: Approx.814g/28.7oz Aperture: F8.3-F16 Bayonet: PK Bayonet Optical Structure: 4 Elements in 2 Groups Lens Type: Manual Focus Anti Shake Type: Without Anti Shake Front Filter Diameter: 67mm/2.6in Minimum Focusing Distance: 1.6m/5.2ft Focal Length: 420-800mm/16.5-31.5in Applicable Models: for Pentax PK Mount Camera Body. Package List: 1 x Lens1 x Front Lens Cover (Installed)1 x Back Lens Cover (Installed)1 x Storage Bag 1 x Adapter Ring1 x Wrench 1 x UV Filter 1 x Dust Cloth 1 x Manual