How to get the minimum and maximum depth of field?

The easiest way to get the minimum depth of field in shooting is to use the maximum aperture. If the light is too bright, using the maximum aperture to match the fastest exposure on the camera is still excessive. One of the solutions is to use a gray filter, and the other is to switch to a film with a lower film speed.

The easiest way to get the maximum depth of field is to narrow the aperture and use the smallest aperture on the camera as much as possible.

Advantages of SLR cameras:

The SLR camera has only one lens, which is used for both shooting and framing, and the parallax problem is basically solved.

Single-lens reflex cameras can be replaced by various wide-angle, medium-focus, telephoto or zoom lenses, and can also be equipped with close-up lenses, telescopic rings or telescopic leather cavities as needed.