Sigma announced the new 70-300mm f/4-5.6 DG OS telephoto zoom lens. It features Sigma’s Optical Stabilizer function which allows for shutter speeds approximately 4 stops slower than would otherwise be possible, SLD glass element for correction of all types of aberrations, and Super Multi-Layer Coating to reduce flare and ghosting. The lens has a minimum focusing distance of 150cm (59.1″) throughout the entire zoom range and a maximum magnification ratio of 1:3.9. The Sigma 70-300mm f/4-5.6 DG OS zoom lens is ideal for many types of photography such as sport, nature, and close-up photography.
Sigma 70-300mm f/4-5.6 DG OS Press Release
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I have the sigma 70-300mm DG OS lens with Canon mount for my Canon EOS 50D camera. I am suprised at how well it handles. The images are sharp. The speed of auto focus is quick and accurate. Although the auto focus motor is a bit noisier then Canon’s version, that does not bother me and it has no effect on the pictures. I was attracted to the lower price. Clear images through all the zoom range and when zoomed in all the way and manually focused, you can actually get a very close details of an object in the viewfinder. Everyone says this lens is for amateurs. If you understand how to use the equipment and use it properly you can get professional pictures. It is the skill, talent and knowlege of the photographer that has a huge impact on the results you get with this lens. True, it is not the fastest lens but my camera has excellent high speed ISO capabilities so that counters the problem. Also the Optical Stabalizer works perfectly with my camera. Excellent for low light situations. It makes shaky hand movement dramatically much more still.
I have a 17-85mm Canon IS lens already. I was looking to extend my range without breaking my bank account. This fits my budget and purposes perfectly.