For Canon 420‑800mm Aperture F/8.3‑16 Full Manual Focusing …, Bishan

1. With 420‑800MM 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 multi‑layer 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 EF‑S mount camera, used for shooting long distant objects.

Specification:
Condition: Brand New
Item Type: Manual Focusing Lens
Material: Plastic + Aluminum Alloy + Optical Glass
Color: White
Focusing Mode: Full Manual Focusing 
Aperture: F/8.3-16
Anti-Shake Function: No
Fitment: for EF-S Mount Camera
Weight: Approx. 913g
Focal Distance: Approx. 420-800mm/16.54-31.50inch
Front 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 List:
1 x Lens
1 x Front Lens Cover
1 x Rear Lens Cover
1 x Storage Bag
1 x Adapter Ring
1 X Wrench

Note:
The aperture changes with the change of focal length, and the aperture cannot be adjusted under fixed focal length without adjusting ring