24-70 2.8 L vs 24-105 4 L (ou 'reverse' focale vs 'extended' focale)

[Nonorab]

mais cette "reverse" focale me derange un peu plus

En quoi cela te dérange ?

Reverse zoom ( wiki )

An unusual aspect of the 24-70mm f/2.8L (and 28-70mm f/2.8L) is that its barrel extends as it zooms toward its shortest focal length. When used with the supplied lens hood, which attaches to a non-moving part of the lens, this extension results in a properly matched shade at every angle of view. Most zoom lens hoods are designed for only the widest angle of view, offering progressively inadequate shade at longer focal lengths. At the telephoto end (70 mm) the end of the lens is the most retracted providing the most shade protection from the lens hood. At the widest end (24 mm) the end of the lens is the most protruding providing the least shade protection from the lens hood.