Buy from Amazon.com : http://fave.co/1BPiHZP
Opteka 500-1000mm f/8 High Definition Mirror Telephoto Lens with Microfiber Cleaning Cloth
Product Description :
HD super multicoated glass optics with anti-reflection coating for the sharper images
Manual focus digitally-optimized telephoto zoom lens
Great for the wildlife or nature photographer who wants to be hidden while taking photos of the subject
Gives you the equivalent of looking through a pair of 20x power binoculars
Soft pouch and three 3 rear mounted 305mm filters ND-2X ND-4X and Skylight