Equivalent Exposure

What is the equivalent exposure?

Let's take an example: let's say I found the right exposure in automatic mode. I make a portrait and I want to increase the aperture to have more blurred in the background. To maintain the same exposure, I need to change another setting (ISO or shutter speed).

There is a logic behind the triangle of exposure that will allow us to quickly find similar exposures. The only problem is that we will have to learn all this a little by heart, or really use it often for once again, to integrate this technique.

Fortunately, this tool is there to simplify you that!

Use

In the "Origin exposure" section

1. Set the values of your exposure (obtained automatically for example) by turning the wheel or by clicking to enter the value

In the "equivalent exposure" section

2. Select the data to be determined (which will be used to compensate the exposure) by turning the wheel or by clicking to enter the value

3. Set the other values according to what you want for your new exposure.

4. Raise the calculated value to make your new setting. The picture taken with this new setting will have the same exposure as the one taken from the previous setting.

5. The information "Real shutter speed" is the actual speed of the sensor exposure if it was timed. On the cameras we find the nominal value and not precise.

Examples

Equivalent exposure with 4 photos taken in ISO 100.

The EV of these 4 photos is 13.

On the other hand, it's noticeable that the depth of field is much greater with a smaller aperture (Look at the background between the photo taken in f/3.5 and f/22).