How to adjust the focal length of SLR camera is automatic?

The focal length of a SLR camera can only be achieved by manually adjusting the zoom ring, and the focusing can be switched to manual focusing and autofocus.

1. Take Canon 220F as an example. First, adjust to the aperture priority.

Then you can adjust the aperture by turning the gear left and right. The circled area in the figure below is the aperture value. The maximum or minimum aperture value is not necessarily because the lens is different.

3, you can set it to 5 first, and the camera defaults to 5 at first. Take this value first.

4, the afternoon is the effect of this value, you can have a look, the back is vague.

5. Adjust the value to 13 and shoot again.

6, finally see the effect, this is relatively clear.

Precautions:

1. When adjusting the focal length of a SLR camera, handle the lens carefully to avoid damaging it.

2. When adjusting the focal length of the SLR camera, keep the lens mirror clean to ensure clear imaging.

3. When adjusting the back focus, please ensure that the lens aperture is at the maximum opening position (to reduce the depth of field and accurately find the imaging focus). Otherwise, the image will be clear in strong light. However, in a dark environment, the image is blurred.

4. Please install the lens before the camera is turned on to prevent the camera from turning on. Strong light irradiates the surface of CMOS/CCD photosensitive target, which leads to the burning of CMOS/CCD photosensitive device.