People are excited about periscope cameras - last week's poll shows that the high zoom levels they enable will be a key consideration the time comes to buy a new phone. There are plenty of phones with a tele camera on the market right now, but they are almost exclusively 2x. From the comments it's pretty clear that the excitement about periscope cameras will be much higher if they offered smooth zoom. There have been such cameras in the past (e.g. the Zenfone Zoom), but the upcoming crop of phones (e.g. Huawei P30 Pro and Oppo Reno) will have a locked focal length. People are concerned...