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Oh so this is the kind of push auto focus you're talking about. I can be the first one to tell you this will not sell. Not enough ppl are so incompetent when it comes to focusing that he/she would rather take the effort to switch in/out of progressive mode to get a quick auto focus. The delay when switching is just too much, and manual focusing is just not that difficult to warrant a purchase of this kind. I don't know where you find so many ppl that shot in the way you described. I think inheriantly, the problem with all dual hand-grip shoulder mounts is that you loose zoom and focus control. Unless you also add zoom control to this device, it would not be worth the purchase. Not even for $20. But eithercase, this push auto focus should be cheap right? I mean all you'd need to do is attach a photographer's wired remote shutter release cable to a ring that clamps to the lens barrel and the end of the wire would be placed above the auto focus button, and when you push, it would press down the auto focus button.Many DV users shoot with the Manual Focus and use the Push
Auto for momentarily go to Auto in order to re-focus for a new situation
Unless you also add zoom control to this device also, it would not be worth the purchase.