Need some advise. I have a Sigma 10-20 f3.5 ex DC HSM for Canon and I am looking for a zoom gear to fit in a Sea&Sea MDX 70D housing. The S&S Zoom Gear (#31142) is described to be used for the f/4-5.6 version of the Sigma 10-20 lens.
Does anybody know which zoom gear I should get for my Sigma 10-20 f3.5 ???