How does sigma dg 28-300 zoom lock work

Hello. I just got a Sigma DG 28-300mm lenses for my Canon Rebel XT. I am told that the lenses has a zoom lock. Where is it? How is it used?
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More about sigma zoom lock work
  1. Sigma zoom lock, small toggle on base of lens that stops the zoom lens opening under gravity, it locks the Zoom at smallest mm setting or all the way in!
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