17.5mm to 35 mm you mean...It could be collapsible like some of the M lenses, but the objective will still have to be a reasonable size to make 20mm work well. 28-50 could be much smaller, but not nearly as flexible. I like the range. The 11-22 on the M is a delightful lens and this translates to 12.5-35, which would be better for general purpose use but still cover the wide end well. It is worth noting that the 11-22 is collapsible, but it is still one of the biggest and heaviest of the M series lenses. If this lens has the kind of IQ that the 11-22 has, it will be wildly popular. In fact, that could be the trigger that gets me to buy an R body.