Feature 1 With 420800MM super telephoto zoom, telephoto lens conducive to shooting long distant scenery, wild animal, concerts, bird watching, etc. 2 Manual adjustment, all metal structure, optical glass multilayer MC coating film. 3 High quality aluminum alloy body, exquisite with texture. 4 Compact appearance volume designed, convenient to carry, foot frame ring fixed. 5 Wide range usage, lens with T2 mount, can install on telescope, for observation of moon, through standard adapter ring, can installed for EFS mount camera, used for shooting long distant objects.Condition: Brand NewItem Type: Manual Focusing LensMaterial: Plastic + Aluminum Alloy + Optical GlassColor: WhiteFocusing Mode: Full Manual Focusing Aperture: F/8.3-16Anti-Shake Function: NoFitment: for EF-S Mount CameraWeight: Approx. 913gFocal Distance: Approx. 420-800mm/16.54-31.50inchFront End Filter Caliber: Approx. 67mm/2.64inch How to use:1) Turn on "Shutter Release: No Lens" (if available) and set the camera to M mode;2) Adjust the lens to the required aperture/set distance;3) Fine-tune the front focus ring to focus the subject and take sample photos. If the picture becomes dark, please set one of the following steps. a. Reduce the shutter speed from 1/500s to 1/100s or reduce 1/50, etc.;b. Increase the ISO number from ISO 100 to ISO 200/400/800, etc.c. Use remote shutter release and tripod to increase image stability;d. Switch positions to allow more ambient light to enter the camera's imaging sensor through the lens; constant practice and exploration of the fun of manual telephoto lenses may take time to get the ideal photo.Package List1 x Lens1 x Front Lens Cover1 x Rear Lens Cover1 x Storage Bag1 x Adapter Ring1 X WrenchNoteThe aperture changes with the change of focal length, and the aperture cannot be adjusted under fixed focal length without adjusting ring