Canon RF 70-200mm F2.8L IS USM

The first time I set eyes on the RF 70-200mm F2.8L IS USM was at the Photography Show last year, where Canon had its first sample on display behind glass. Waving my press pass in the right direction meant I was allowed to handle the mock-up. It was at this moment I became aware of how Canon had gone about making such a short and light 70-200mm f/2.8 zoom for interchangeable-lens cameras with a full-frame sensor.

Unlike L-series EF-mount zooms that cover the same focal length, this fast tele-zoom has an extending barrel, which measures 203mm long when extended to 200mm and a modest 146mm when fully retracted to 70mm. The questions this begs are: does this extending design