Escala EV
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
EV
About this calculator
The EV scale is a measure used in photography to evaluate the quality of an image on a sensor.
It is calculated with the formula EV = log₂(N²/t), where N is the average exposure and t is the exposure time.
This scale is useful to understand how changes in exposure and exposure time affect the final image quality.
The EV scale is especially important in high-quality photography, where small variations can affect the appearance of the image significantly.
Frequently asked questions
What is the EV scale?
The EV scale is a measure used in photography to evaluate the quality of an image on a sensor. It is calculated with the formula EV = log₂(N²/t), where N is the average exposure and t is the exposure time.
When to use the EV scale?
The EV scale is useful in high-quality photography, where small variations can affect the appearance of the image significantly. It is especially useful to understand how changes in exposure and exposure time affect the final image quality.
How does the EV scale relate to exposure and exposure time?
The EV scale is calculated with the formula EV = log₂(N²/t), where N is the average exposure and t is the exposure time. This means that the EV scale is affected by changes in exposure and exposure time.
What is the purpose of the EV scale?
The purpose of the EV scale is to provide an objective measure of the quality of an image on a sensor. This is especially useful in high-quality photography, where small variations can affect the appearance of the image significantly.
What are the common precautions to take when using the EV scale?
Some common precautions to take when using the EV scale include understanding the formula and how it is calculated, as well as being aware of variations in exposure and exposure time. Additionally, it is essential to remember that the EV scale is only a measure and not an absolute criterion for evaluating image quality.