0ur opinion: :Telephoto zoom lenses with excellent cost performance and optimized for use with digital SLR cameras.Capable of macro photography, this lens has a 1:2 maximum close-up magnification at the 300 mm focal length. lt's the ideal high performance lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range. lt also has a switch for changeover to macro photography at focal lengths between 200mm and 300mm with a maximum close-up magnification from 1:2.9 to 1:2.SLD (Special Low Dispersion) glass in this lens provides excellent correction of chromatic aberration.
:The Sigma 70-300mm f4-5.6 DG Macro Lens for Nikon Digital SLR Cameras features a 1:2 maximum close-up magnification at the 300 millimeter focal length. An excellent cost performance telephoto zoom lens for digital and 35mm SLR cameras, this lens also has a switch for changeover to macro photography at focal lengths between 200 millimeters and 300 millimeters. The minimum focusing distance 59.1 inches at all zoom settings. 0ptimized for digital photography, the lens features SLD (Special Low Dispersion) glass for excellent correction of chromatic aberration.
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* It eats light, but it still works great ...
This is one of the best lenses you can buy for the price. The photos are clear and crisp. The only major problems is that it takes a ton of light to get a properly exposed picture, and if you don't have a DSLR that has AF built in it can be a challenge to get the lens to maintain its focus. This is a great lens for the price, just make sure you have a nice flash to get the most out of this lens.
Buyer's feedback: 
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Economical, but not fast or pro.
I've purchased the Sigma 70-300 f/4-5.6 DG Macro in 2007.
I purchased this for the use of photographing sports, especially football. Through my experience, this lens is worth it when shooting in ample light (meaning your shooting at least 1/250 @ ISO 800) and you're not shooting anything to increase your credibility. The lens is nice in terms that it's pretty large and the lens hood adds about 1.5" to the lens, which makes you look important if that's the case. On the other side, the lens is a little slow in terms of, the aperture is not large enough and the AF is slower since it's screw driven and covers a larger distance focus. *Just in case: A faster lens means that it has a large aperture closer or better to f/2.8 and you can use a faster shutter speed*
The lens does not have superbly dense photograph quality, but is acceptable with it's focal length coverage and low price. One this also is that the barrel rotates when focusing so beware for your fingers catching when focusing.
If you are on a budget, but want to have a telephoto lens and aren't in need of a fast lens, this Sigma 70-300 will work for your needs.
Buyer's feedback: 
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* Great Value ...
The lack of IS and auto-focus is going to turn off a lot of people, but I paid extra for a DSLR so I could manually focus so the bare bones nature of this lens is a positive for me. If you have plenty of light, a steady hand, and a little patience then this is a fantastic buy. For $80 shipped to my door it fills a gaping hole in my lens collection without costing a lot of cash.
Buyer's feedback: 
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Justshootin
Great lens. Used it for candid photo's with friends at our chess match a lot. Will be also using it at a wedding in Kula, Maui in two weeks! Can't wait. Aloha!
Buyer's feedback: 
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* Great Lens For The price ...
I came across this Sigma lens on Amazon - and I thought the price was a typo. I could hardly believe it was less than $80! Let me tell you at that price this is a great lens shipped amazingly quickly by 47th Street Photo. It's not a US warranty version, but that's ok for this price. Superb value for money.