Factors that affect Depth of Field

Focus Parameter	Increase Depth of Field	Decrease Depth of Field
Light Intensity	High	Low
f-stop	Larger (f16)	Smaller (f1.4)
Iris	Smaller	Larger
Camera to Subject Distance	Smaller	Larger
Focal Length	Shorter	Longer
Zoom	Wide (W) / Out	Telephoto (T) / In

 

The two main factors that affect Depth of Field are:

1. Light Intensity
2. Camera to Subject Distance