The Push-Pull Zoom Was Faster Than Any Modern Zoom Ring and Dust Got the Blame

When Canon announced the replacement for the EF 100-400mm f/4.5-5.6L IS USM in November 2014, the change photographers argued about was the disappearance of the sliding zoom collar rather than the optics or the stabilizer. The reason repeated everywhere at launch was that a rotating ring stops dust from being pulled into the barrel. That announcement retired what a lot of photographers still consider the fastest zoom control ever fitted to a camera lens. [Read More]