ND Neutral Density.

Term used to describe filters that absorb all visible light to a given degree. Not having a color effect, they can be used both in color and B&W photography.

Negative

A processed piece of film where the image is reversed so that the shadows are light and the highlights are dark.

Neutral Density Filter

A dark filter that attaches to a lens in order to control the amount of light reaching the film.

Newton Rings

Colored, ring-shaped patterns that appear between two transparent tightly pressed surfaces like glass or film. Caused by moisture between the surfaces refracting the light.

Ni-Cd

Nickel-Cadmium, or Ni-Cad, rechargeable battery that should be completely discharged before it is recharged.

Ni-MH

Nickel Metal Hydride rechargeable battery that does not need to be completely discharged before it can be recharged.

Normal Lens

A lens where the focal length is approximately equal to the diagonal of the film size it's being used for. This is also representative of the field of view of human sight. In 35mm format it is approximately 50mm, in medium format approximately 90mm, in 4x5 approximately 200mm.