Product Description

This compact aporchromatic ultra telephoto zoom lens covers the range up to 500mm and it is ideal for taking sport, nature and landcape photographs.This lens uses one aspherical lens and three SLD glasses for excellent correction of chromatic aberration. Color aberration in the secondary spectrum is compensated by using three pieces of Special Low-Dispersion glass (SLD), and making high-quality images a reality throughout the entire zoom range.The five-group zoom and rear focus systems ensure high performance stability and ease of use.A removable tripod collar is included as a standard component.

Product Details

• Brand: Sigma
• Model: 733-109

Amazon.com Product Description
Sigma combined a five-lens group zoom system with an aspherical lens element when they designed the 170-500mm f5-f6.3 APO aspherical lens. This combination gives your images sharp high-contrast images throughout the entire zoom range. Its unique apochromatic lens design and three SLD glass elements help eliminate the vibrations usually found in ultra-telephoto lenses. Since the front lens group doesn't rotate, polarized filters are extremely easy to use. This lens also has a built-in rotary tripod mount to help keep the lens steady, reducing vibration during shutter release and keeping your images sharp and clear. This model is dedicated to Pentax AF SLR cameras.

Customer Reviews

Best lens for the money!!!
I purchased this sigma 170-500mm lens about 2 mos ago, and was very impressed with it from the start! The lens has a good feel to it! not very heavy, but well built! The only thing I would change is the manual focus ring! it is a bit loose and hard to micro adjust! after about a week of practice, I think I have mastered it. Now the important part! picture quality! I have used this lens to photograph birds, deer, seals, and zoo animals, every time the pics came out clear and sharp even at the edges. I sometimes use a Kenko 2X converter to bring my zoom to 1000mm and still get sharp pics! I've owned Canon lenses in the past and was very happy with them also, but Sigmas photo quality is very close if not eaqual to any comprable canon lens! why pay 2-3-4 times more??? I curently own 4 sigma lenses "20-70mm, 28-105mm, 70-300mm, and 170-500mm" and am very happy with all 4 lenses! the true test will be when you strap it onto you canon,nikon, or any oter camera you own and see for yourself.