Like the RF 70-200mm F2.8, the F4 edition features a retractable design. It's in contrast to 70-200mm lenses for SLRs and other mirrorless systems, which almost exclusively use internal zoom. It makes the lens as small as a typical 24-70mm when retracted, about 4.7 by 3.3 inches (HD). The F4 lens is a little smaller all around than the RF 70-200mm F2.8, and lighter—1.5 pounds versus 2.6 pounds. The lighter build means you don't need a tripod collar either, further reducing bulk. Bother inner and outer lens barrels use polycarbonate materials. A reversible lens hood is included, along with a drawstring pouch. The front element supports 77mm filters and has the expected anti-reflective and anti-smudge fluorine protection. The lens itself is protected from dust and splashes, just like others in Canon's L series. Its light gray finish is a hallmark of the L series.