All of my digital shooting has been on crop sensors, but I’ve also used 35mm film for portraits.
My favorite lens for working in a group of people is my 20-40 Limited, which covers the same field of view roughly as a 35-60mm would on FF. 20/35mm isn’t so wide that it distorts a persons face or shape, and 40/60mm gives enough compression for a more flattering look.
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The DA*50-135, and for you the 70-200, was my real workhorse for portraits. 50/70 is wide enough for upper torso shots, even indoors, and 135/200 is great for headshots. Mind the aperture so the whole face stays in focus.
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Honestly my equipment thoughts on portraits leans towards lighting over lenses. A simple single off-camera flash in a soft box or shot through an umbrella, or hell an on-camera flash (Not the on board flash) bounced off the ceiling, can dramatically change a portrait, more than a lens imo. Most of my favorite shots, going through them now, are done with relatively short lenses but nearly all have additional lighting or really good natural light.
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