A night cityscape or illuminated building exposure often runs past a camera's built-in shutter range, needing Bulb mode tracked precisely rather than guessed.
Illuminated building with light trails from traffic: typically 15-30 second exposures depending on traffic speed.
Very low light night architecture: can extend beyond 30 seconds, needing precise manual tracking in Bulb mode.
Tips for this niche
Keep the timer visible for the full exposure — an architecture long exposure interrupted early leaves the building itself underexposed even if the light trails look fine.
Use a preset close to your planned time when possible, rather than relying only on the freeform stopwatch for a precise architectural exposure.
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This topic is covered in depth in Lesson 4: Architecture & Interiors.
Example scenario
A 25-second exposure of an illuminated bridge and its traffic trails needs precise tracking in Bulb mode. Starting the timer the instant the shutter opens and watching for the alert at zero keeps the bridge structure's own exposure consistent with the planned calculation.
Common mistakes
Guessing the shutter duration in Bulb mode. even a couple of seconds of error changes the building's own brightness noticeably at long exposure times — track it precisely rather than estimating.
Not accounting for changing light during the exposure. a building's illumination timer, a passing vehicle's headlights, or changing sky brightness during a long exposure can all shift the result — plan around known consistent conditions where possible.
FAQ
Why does an architecture long exposure need Bulb mode?
Once the calculated exposure time for the desired light trails or low-light detail exceeds the camera's built-in maximum shutter speed, usually around 30 seconds, Bulb mode with manual timing takes over.