Shot with: Canon C100, Panasonic GH4, Canon EF 24-70mm f/2.8L, Sigma 18-35mm f/1.8
Thoughts: I waited about a year before purchasing the Sigma 18-35. I heard there were focusing issues and such so I wanted to wait until they straighten out the kinks. I wanted this lens for my C100 to get that wider angle and fast aperture. Here are my findings after I finished the narrative shoot above.
1. It's sharp wide open at f/1.8.
2. While some people say it's pretty hefty, I say it's lighter than my Canon 24-70mm f/2.8 (Mark 1).
3. I like the smooth focusing. It has a long focus throw.
4. My C100 has the upgraded dual pixel AF (DAF). When the lens arrived and I first got the lens on, it worked great. Very quiet DAF. On the day of the shoot, it wouldn't auto focus. Even after turning the C100 on and off. After the shoot and when I got home, I removed the lens and placed it back on, the DAF started working again on the C100. Very weird. It's happened only once so far. I hope it does not continue to happen. Update: Sigma has released firmware v1.02 for the 18-35mm f/1.8 and autofocus is supported at any aperture when used with the C100.
Overall, I am satisfied with the quality that I'm getting with the Sigma 18-35 on the C100 for the price. It has a very short focal length, though, so I still find myself switching to the Canon 24-70mm f/2.8 (Mark 1) to get that extra reach when I need it.
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