Camera Lenses

Parameters

• Focal Length
• Hyperfocal Distance
• Circle of Confusion (CoC)
  • When the converging point of the image cone is in front of or behind the focus, the image formed on the screen is a circle, not a point. This circle is called the Circle of Confusion.
• Depth of Field (DOF)
  • The distance between objects that create a focus range of acceptable circle of confusion is called depth of field. The region that is not in the focused range forms a bokeh.
  • Awesome Notes on DOF | PhysicsSoup WP Blog (2012)
• Aperture
• Lens Mounts

Types of Lenses

By structure

• Convex | Concave
• Plano Convex | Plano Concave | Convexo-Concave | Concavo-Convex
• Fresnel Lens - thinned plano-convex lens, by cutting out rectangular segments, making no significant change in angle of refraction.
  • It has distortion which makes it bad for imaging applications

By Functionality

• Fisheye Lenses / Ultra Wide Angle Lenses
• Wide Angle Lenses
• Telephoto Lenses
• Macro Lenses