Hi Jamie,
Yes, I have experienced the zoom creep and have fitted a thick red post office rubber band across the main lens body and zoom ring and it holds it well. I also have a spare 7 x 50 standard Celestron finderscope that I can use if all else fails. I think I should be able to get a male (threaded) to 1.25 female adapter for it quite easily. I would really like to use the Sigma lens though, so, I will keep hunting for a solution.
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