Sigma 17-70 for sports?

[Stargazerfrank]

does the sigma 17-70 focus fast enough for sports like auto racing 30 feet away.

[steve wicks]

No ........ I had one, its terrible.

[Stargazerfrank]

what about 28-135. right now I use the 18-55II it's fast enough but I would like better glass. $400 is the limit.

[swizcore]

My Tamron 17-50 does .

[stormjury]

I have one I use almost exclusivly for Drifting. It is a fantastic lens, at night it is a little slow on foccusing but day is no issue at all.

Camera:Canon EOS 20D (http://www.flickr.com/cameras/canon/eos_20d/)Exposure:0.013 sec (1/80)Aperture:f/8Focal Length:17 mmISO Speed:100
http://farm4.static.flickr.com/3235/3103185969_7c3b03a0aa.jpg

[Moppie]

Prefocus on the track, and as long as it doesn't have to refocus to much, it can be made to work.

I have shot A1GP cars with, with some sucess. Although I was doing crazy things with slow shutter speeds, so don't ask to see any examples :)

[Stargazerfrank]

thanks guys i'm getting a new one 2-10-09 i'm gonna try it out next Sunday at a dragstrip.