Canon RF 600mm F11 IS STM
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Canon RF 600mm F11 IS STM

Alongside the 100-500mm Canon unveiled two very unusual lenses, both of which employ collapsible mechanisms and DO - Diffractive Optics - elements in their designs, to reduce their size and weight. The first is the RF 600mm F11 IS STM. Canon claims that the use of a new material for the gapless dual-layered DO element allows for smaller and more cost-effective designs compared to the EF equivalents.