I don't understand what the diopter of a digital camera is.

Refraction: the ability to express refraction by optical power. The unadjusted refractive state of the eye is called static refraction, and the static refractive power of the standard eye is-58.64D d.

When refracted light is emitted from one object to another with different optical density, its propagation direction is deflected.

Some high-end cameras have added diopter adjustment devices to facilitate people with mild myopia or presbyopia to watch the effect directly in the viewfinder without glasses. In fact, the diopter adjustment device is to add a group of lenses to the eyepiece of the camera, and adjust the position relationship of the lenses through the knob to realize continuous diopter conversion within a certain range.

The range is generally between -3d and +2d. Because the diopter adjustment range is limited, users with moderate myopia beyond this range can choose a special eyepiece adjustment mirror.

Extended data:

The function of diopter in digital camera;

The diopter adjuster is designed for users who wear glasses. When they take off their glasses, they can clearly see the shooting scene. If you can't see it clearly, it means it's not adjusted well. You can try to adjust it repeatedly until you see it clearly. Don't adjust it once, as long as it's not myopia or hyperopia.

Refraction adjustment is suitable for people with vision problems such as myopia or presbyopia. Through diopter adjustment, you can directly observe the image from the viewfinder without wearing glasses, and achieve the best effect like wearing glasses. It's very user-friendly and complicated, and a set of diopter adjustment lenses is added.

This design is now available on SLR cameras and high-end telescopes. Generally, it can be adjusted to about 200 degrees.