Photographic zoom ring

1 aperture is an important mechanism to control the amount of light entering the photographic lens, thus controlling the illumination level of the image surface.

2 the main means to control the depth of field

Aperture is also an important factor affecting the imaging quality of photographic lens.

The role of the shutter:

1. The basic function is to control the effective exposure time and meet the exposure needs with the aperture.

2. It affects the image clarity, which is manifested in moving the body to shoot and holding the camera steady.

3. The curtain shutter also cooperates with the flash to realize the synchronization of the flash.

Function of focus ring:

Focusing is also called focusing. Only by accurately adjusting the subject to focus can we highlight the image and guide the audience's attention.

The zoom ring of double-ring zoom lens only has zoom function, which has no effect on focusing.

Single-ring zoom lens, also called push-pull zoom lens, is easy to understand. The zoom ring and the focus ring are integrated.