Calculate Exposure

ND Long Exposure Tool

Convert your standard shutter speed to a filtered time.

Base Shutter Speed (e.g., 0.01 for 1/100s)

Filter Power (ND Stops) ND8 (3 Stops) ND64 (6 Stops) ND1000 (10 Stops) ND8000 (13 Stops)

Final Shutter Speed

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Enter data above

📝 Operation Guide

1

Initial Metering

Meter your scene without the ND filter. Note the shutter speed (e.g., 1/250s = 0.004).

2

Calculate

Enter that time and select your ND filter strength. Click the calculate button.

3

Camera Setup

Attach the filter. Switch to Manual Mode. If the result is >30s, use Bulb Mode.

Why Use an ND Filter Calculator for Long Exposures?

Mastering long-exposure photography requires precision and patience. When you attach a Neutral Density (ND) filter to your lens, you are essentially "wearing sunglasses" for your camera, which reduces the amount of light hitting the sensor. This allows you to use much slower shutter speeds to create silky-smooth water or moving cloud effects, even in broad daylight.

Understanding ND Filter "Stops"

The strength of an ND filter is measured in "stops". Each stop reduces the light by half, requiring you to double your exposure time to maintain the same brightness. For example, using a popular ND1000 (10-stop) filter means you need to increase your shutter speed by 1,000 times.

Pro Tips for Perfect Long Exposures

• ✔️ Lock Your Focus: Always focus your camera before attaching the ND filter, as the dark glass can make it difficult for your autofocus to work.
• ✔️ Use a Sturdy Tripod: Any camera shake will ruin a long exposure. Ensure your tripod is weighted and stable.
• ✔️ Cover the Viewfinder: On DSLR cameras, light can sometimes leak through the viewfinder during long exposures. Use a small cap or piece of tape to cover it.