Je dirais le 70-200L de Canon que ce soit f/4 ou 2.8 !

Naturellement, portrait à l'extérieur d'un studio concernant ce zoom.

À noter que pour moi un portrait c'est un close-up du visage.

Source : http://www.the-digital-picture.com/R...ns-Review.aspx

There are MANY uses for the Canon EF 70-200mm f/4.0 L USM Lens, but portrait photography is one of the best uses. Classic portrait focal lengths range from 85mm to 135mm effective focal lengths (field of view crop factor included). The 70-200 f/4.0L lens comes with many of those mms built in. I often use even higher focal lengths for tight portraits - the 1.6x FOVCF bodies allow these tight-framed shots. Zoom, frame and shoot.