Lens language: what '85mm' does to an AI portrait
Ask for "a portrait" and you get the model's default framing. Ask for "shot on 85mm" and the render changes lens — tighter crop, compressed background, shallower focus. The model learned from photography metadata, so focal lengths behave like switches.
What the numbers actually do
35mm is the storytelling lens — the subject plus the world around them, slight wide-angle stretch near the edges. Street photography lives here. "35mm environmental portrait" keeps the scene in the story.
85mm is the portrait lens — compression flattens facial features flatteringly, the background falls soft. Most editorial beauty shots are 85mm-class. "85mm portrait, shallow depth of field" is the reliable glamour recipe.
200mm and longer compresses hard — backgrounds stack up behind the subject and everything flattens into layers. "Long lens compression" is how a distant mountain ends up towering behind a person.
Wide lenses (24mm and under) stretch space — drama near the edges, big environments. "Ultra-wide environmental shot" for epic scale; avoid it on faces, which is exactly what real photographers avoid too.
Depth of field is a second dial
"Shallow depth of field" or "f/1.8" blurs the world into bokeh and throws the eye at the subject. "Deep focus" or "f/8" keeps the whole frame readable — the landscape choice.
Pair focus with distance: "close-up, shallow focus" isolates; "wide shot, deep focus" situates. The combination is a decision about what the viewer looks at, and the model honors it.
Prompts that work
"Editorial portrait, 85mm, f/1.8, soft window light, blurred studio backdrop." — lens plus aperture plus light: a complete shot brief.
"Street portrait, 35mm, city bokeh behind, subject sharp in foreground." — the lens keeps the street readable but subordinate.
"Macro shot — dew on a leaf, extreme detail, shallow focus." — macro flips the model into texture mode.
"Long-lens compression — distant mountains towering behind the hiker." — the landscape-photography trick in one phrase.
The honest limits
Focal length is a tendency, not a simulation — the model renders the look of 85mm, not the optics of it. Distortion character (fisheye curves, anamorphic stretch) lands as suggestion, not physics.
Lens words compound with light words: "85mm, golden backlight" beats either alone. The full lighting vocabulary is in the lighting terms guide.