Retracting design
1 5 6 7 8 9 10 11 12 13 15

Retracting design

Retracting / collapsing designs have been around for as long as photographic lenses have existed, and the basic principle (and benefit) has remained the same - extend and lock the mechanism when you need to shoot with the lens, and retract / collapse it when you don't, for compactness. This isn't possible with complex multi-element primes (let alone zooms) but for a long tele like the RF 600mm, where most of the glass is clustered together, in a design with a lot of empty space between groups, it becomes an option.