Short answer: faces are flattered by distance, and an 85mm lens makes me stand at a flattering distance to fill the frame with a head and shoulders shot. Up close, a camera exaggerates whatever is nearest it, which is why phone selfies stretch noses and foreheads. The 85mm has been the portrait standard for decades because it keeps proportions honest. It is the lens on my camera for most headshot work.
Here is the part most explanations skip: a lens does not create distortion, distance does. Stand very close with any camera and the nose, being inches nearer than the ears, records noticeably larger. Step back and the proportions even out because the relative distances shrink. A longer focal length simply forces the step back, since you have to move away to fit the same framing. The lens gets the credit, but the distance does the work.
Six to eight feet is a comfortable distance between two people having a normal conversation. At that range I can coach your expression, adjust a shoulder, and keep things relaxed without being in your space with a camera. A wider lens would put me uncomfortably close for the same framing, and most people tense up, which shows. Some of the 85mm's reputation is really about how at ease people feel in front of it.
Phone main cameras are wide, roughly a 24mm to 28mm view, which is great for rooms and landscapes and rough on faces at selfie distance. The phone portrait modes that switch to a longer lens or crop in are quietly admitting the same thing photographers have known for years. For a photo that represents you professionally, distance and a portrait focal length are a simple, honest upgrade.
No. On full frame cameras, anything from about 85mm to 135mm gives flattering perspective, and many photographers love 105mm or 135mm. Wider than about 50mm at headshot distance, distortion starts to creep in. The number matters less than the working distance it gives you.
Because the phone is close. At arm's length the nose is much nearer the lens than the ears, so it records larger in proportion. It is not the phone being unkind, it is geometry, and it happens with any camera held that close.
Only a few steps further than a wider lens would. For a head and shoulders frame with an 85mm I am typically six to eight feet from you, which is also a comfortable social distance for conversation and coaching.
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