We talked a bit in the past about how your camera’s crop factor affects the focal length of your lens.
But your camera’s crop factor—a measure of the amount that a scene is cropped based on the size of the camera’s image sensors image sensor—affects more that focal length. The crop factor also has an indirect effect on the depth of field.
Here’s how it works. The larger the camera sensor, the closer you have to get to your subject to get the same level of subject magnification. And the closer you are to your subject, the shorter the depth of field. So that means that, for a given aperture size, the depth of field decreases as the sensor size increases.
I know that all this can be a bit confusing, but a new video from Tony Northrup helps explain this relationship.