The Camera Shutter That Opens From The Center

Small Blades Control A Brief Opening:

Pressing a camera’s shutter button begins a carefully timed exposure. But cameras do not all control that exposure with the same mechanism. A leaf shutter uses overlapping metal blades arranged around a central opening, usually within the lens.

The blades move apart to admit light and close again to end the exposure. Fujifilm describes this circular arrangement in its explanation of the X100F’s shutter. The movement resembles a lens aperture opening and closing, but resemblance alone does not mean the two parts perform the same job.

Aperture And Shutter Answer Different Questions:

An aperture controls the size of the opening through which light passes. A shutter controls the exposure’s duration. Both influence exposure, yet one concerns an opening’s size and the other concerns time. Confusing them makes camera specifications harder to interpret.

Hasselblad explicitly separates these functions when explaining leaf shutters. In a photograph of a dismantled lens, several thin blades may therefore require careful identification. Do not assume every circular blade assembly is an aperture—or that an unfamiliar mechanism can safely be tested by touching its delicate parts.

Curtains Take A Different Route:

A focal-plane shutter sits directly in front of the film or sensor rather than within the lens. A common design uses two curtains: one starts the exposure and the other ends it. The position and movement differ from the leaf shutter’s central opening.

At sufficiently fast settings, those curtains create a narrow moving slit across the image area. The whole frame is not uncovered simultaneously during that exposure. That detail becomes especially important with flash, because a brief burst needs to reach the image area at the appropriate moment.

Flash Timing Makes The Difference Useful:

A conventional flash fired while a focal-plane shutter presents only a moving slit can leave part of the picture dark. Leaf shutters generally support conventional flash synchronization throughout their supported speed range. The useful advantage is flexibility in coordinating a brief flash with the exposure.

Fujifilm highlights broad flash synchronization and quiet operation as benefits of its leaf-shutter design. However, no general description replaces the instructions for a particular camera, lens, flash, and trigger. “Leaf shutter” identifies a mechanism; it is not permission to assume every combination of equipment will work at every setting.

Read Two Speed Specifications Before Shooting:

When comparing camera specifications, separate maximum shutter speed from flash-sync speed. Write down both rather than treating the largest fraction-of-a-second figure as the complete story. Then check whether the specification describes mechanical exposure, electronic exposure, or a particular flash mode.

For a practical learning exercise, consult your camera manual before using flash and follow its supported settings. You do not need to dismantle a lens to understand the principle. The rewarding distinction is structural: blades opening within a lens and curtains crossing an image area can both time an exposure, while creating different requirements for the light that records it.