Moving Water & Waterfalls

Decide first: freeze or blur

Either way, something in the frame must be sharp — rocks, a branch, the bank. Water alone, all blurred, is a texture, not a photograph.

	Freeze motion	Blur motion
Support	Tripod	Tripod + remote release
Shutter	Faster than 1/250 s	1–5 s (often less — see below)
If you can't get there	Open the aperture or raise ISO	Close the aperture or drop ISO; if still not enough, wait for darker light

How fast is "frozen" depends entirely on the water: a slow mountain stream may stop at 1/60 s; Niagara-scale falls need 1/1000 s or faster.

Longer is not always better

Exposure length is a creative variable, not a ladder. In a tested sequence at 4 s, 15 s and 29 s, the 4-second frame had the strongest effect — beyond that the movement averaged into mush. As a starting range, 1/2 s to 30 s covers most moving-water work. Shoot several lengths of the same composition and choose later.

Using an ND filter

• Compose first. Once a strong ND is on the lens you can barely see the scene.
• Compose, meter and focus, then attach the filter and adjust the exposure by the filter's stop value (see Long Exposure — ND Exposure Calculation).
• Manual Focus (MF) once set, so nothing hunts between frames.

Why waterfalls are difficult

The reason they're beautiful is the reason they're hard: they sit in gorges, valleys and deep forest. Extreme contrast causes the exposure problem — bright white water and sky against dark wet rock and shadow.

• Shoot on overcast days. The day you'd normally avoid is the right day for a waterfall — the contrast range collapses to something the sensor can hold, and wet rock and foliage saturate.
• Where sky creeps into the top corners, a graduated ND or an HDR bracket saves it.
• A circular polariser kills the sheen on wet rock and leaves, and costs about two stops — which you want anyway.
• Spray: lens hood on, microfibre in the other hand, check the front element between frames.

Coastal variation

On rock platforms and beaches, the shutter speed choice becomes a wave-timing choice: about 1/2 s–2 s for streaming water pulling off rocks, 10 s+ for flattened, misted sea. Fire on the retreat, not the arrival.

Consolidated from references: Photzy Photographing Moving Water; Kent DuFault, The Complete Landscape Photography Guide (Waterfalls and Waterscapes) and The Complete Guide to Long Exposure Photography.