Purchased this lens for wildlife photography in a dusty location. It did not disappoint. Used it with my 5D MIII and a canon 1.4X v2 tele extender. Focus was fast and accurate. Zoom was smooth and most helpful when we were able to get close to large animals.
Got some great shots. (If interested check my recent web page folders for Kenya and Tanzania. Web site is at kc3m.zenfolio.com)
The lens is heavy, but it was easy to use in a safari vehicle as its balance point with my camera was at the center of the tripod attachment lug. OS seems to work well, as all images on these trips were made without a tripod.
I used F/8 in during daylight and wide open in low light. The 5D MIII focus tracking worked well on moving wildlife.
I plan to use it for a trip to the arctic on marine mammals and will be using a think-tank shield to protect the lens and my camera from water damage. SIGMA cautions that the Sport lens although gasketed is susceptible to water damage.
You get a lot of bang for the buck with this lens. I'm pleased.
Contact me if you want more detail.
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