Aperture diaphragm and depth of field

EFFECTIVE USE OF LENSES

A depth of field is a range in which a lens can focus on objects. So, a lens with a large depth field can focus on a target which moves in the direction of the lens.

< Depth of field >

1. The shorter the focal distance, the larger the depth of field.
2. The longer the distance from the lens to the object, the larger the depth of field. Closeup rings and macro lenses make the depth of field smaller.
3. The smaller the aperture, the larger the depth of field. Small aperture and bright illumination make focusing easy.

When the aperture is closed (CA-LH25)

When the aperture is open (CA-LH25)

A camera is installed as shown in the illustration.
A graduated tape that indicates the height is attached on a slope. In this condition, the pictures are taken for comparison of aperture.