Tempo de Exposição Longa (filtro ND)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
ND
About this calculator
The Long Exposure Time Calculator (ND filter) is a useful tool for photographers working with cameras equipped with ND (neutral density) filters. This calculator helps determine the exposure time necessary to capture perfect images, even in bright light conditions.
The formula used by the calculator is simple and direct: t_new = t_base × 2^stops. This means that the necessary exposure time will be the base time multiplied by the value of 2 raised to the power of the number of stops of the ND filter.
This calculator is especially useful for photographers working in bright light conditions, such as during the middle of the day or in locations close to the sea. Additionally, it is essential to remember that correct exposure is crucial to avoid over or underexposure problems in your images.
Before using this calculator, it is essential to understand the basic concepts of exposure and how the formula works. Additionally, it is crucial to test the settings and adjustments before taking the picture to ensure the best results.
Frequently asked questions
What is the ND filter and how does it work?
The ND (neutral density) filter is a filter that reduces the amount of light entering the camera, allowing longer exposures in bright light conditions. It works by reducing the intensity of the light, allowing you to capture images with longer exposures without needing polarizing filters.
How can I choose the correct number of stops for my ND filter?
The number of stops for your ND filter depends on the type of image you are capturing and the amount of light available. In general, it is recommended to start with a low number of stops and adjust as necessary to avoid over or underexposure problems.
Can I use this calculator for moving images?
Yes, this calculator can be used for moving images, as long as you have a basic understanding of exposure and how the ND filter works. However, it's essential to remember that moving images require much shorter exposures than stationary images.
I have a 10-stop ND filter, how can I use it?
If you have a 10-stop ND filter, this means you can reduce the exposure by 10 times compared to the exposure without the filter. You can use this information to adjust the exposure of your camera and get perfect images.