Should portrait exposure be re-checked during a session?

Yes, whenever the subject or light changes meaningfully — but hold it steady within a single consistent setup so the resulting set edits together cleanly.

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Exposure Calculator for Portrait Photography

A portrait session often needs one exposure held consistent across many frames — solving it once from a metered EV, rather than adjusting by feel shot to shot, keeps the whole set matched.

Exposure Calculator for Portrait Photography

Open the Exposure Calculator

Recommended settings

Window-light portrait: solve for aperture at a moderate ISO (200-400) once the EV is metered, then hold it for the whole set.
Studio strobe portrait: solve for aperture given a fixed flash-sync shutter speed and your chosen ISO.

Tips for this niche

Re-solve if the subject moves meaningfully closer to or further from a window — the EV can shift enough to matter even without changing rooms.
Lock aperture first if background blur is the priority, then solve for shutter or ISO around it.

Got your Portrait settings dialed in?

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Want the full lesson?

This topic is covered in depth in Lesson 6: Shooting for a Genre.

Example scenario

A subject seated near a north-facing window meters at EV 9. Solving for aperture at ISO 200 and a fixed 1/125s shutter (to avoid camera shake) gives f/2.8 — held for the rest of the seated portion of the session rather than re-guessed after every few frames.

Common mistakes

Adjusting exposure by eye shot to shot. small inconsistencies compound across a session and show up as mismatched exposures when the set is edited together — solve once and hold it.
Not accounting for a moving subject relative to a light source. a subject who leans toward or away from a window changes the EV meaningfully even if nothing else in the room changed.

FAQ

Should portrait exposure be re-checked during a session?: Yes, whenever the subject or light changes meaningfully — but hold it steady within a single consistent setup so the resulting set edits together cleanly.

Guides for this tool, by niche

Exposure Calculator for Wedding Photography Exposure Calculator for Landscape Photography Exposure Calculator for Travel Photography Exposure Calculator for Wildlife Photography Exposure Calculator for Sports Photography

Troubleshooting

Why Are My Photos Too Dark? Underexposure Causes & Fixes Why Are My Photos Overexposed? Causes and How to Fix It

Gear guides

Before the shoot

Portrait Photography shot list