ISO Speed
The emulsion speed (sensitivity) of the film as determined by the standards of the International Standards Organization. In these standards, both arithmetic (ASA) and logarithmic (DIN) speed values are expressed in a single ISO term. For example, a film with a speed of ISO 100/21° would have a speed of ASA 100 or 21 DIN.


Stop Bath
An acid rinse, usually a weak solution of acetic acid, used as a second step when developing black-and-white film or paper. It stops development and makes the hypo (fixing bath) last longer.


Ambient Light
The available light completely surrounding a subject. Light already existing in an indoor or outdoor setting that is not caused by any illumination supplied by the photographer.
Photographer: Anna CollinsKINSA/KODAK Photo ContestFilm: KODAK GOLD Plus 200Film Size: 35 mm


Highlights
The brightest areas of a subject and the corresponding areas in a negative, a print, or a slide.


Fixing Bath
A solution that removes any light-sensitive silver-halide crystals not acted upon by light or developer, leaving a black-and-white negative or print unalterable by further action of light. Also referred to as hypo.


Extra High Grade
A truly high grade tape will demonstrate its differences mostly in the quality of the image recorded. Extra high grade tape coatings are generally superior in noise immunity and lower in dropouts. This means that you get a better recording, and you'll get a better second and third generation copy. Several manufacturers have indicated on their packaging that they have done things to also provide greater longevity, but this is a claim that would be difficult to prove or disprove. For especially valuable recordings, use a high grade tape; but remember that there is no standardization and no requirements that prevent anyone from naming a product "extra high grade." Buy a tape with a brand you trust.


RF Output
The playback output level of the recorded FM signal. Lower RF output levels can result in increased noise levels in the playback signal.

Graininess
The sand-like or granular appearance of a negative, print, or slide. Graininess becomes more pronounced with faster film and the degree of enlargement.

Underexposure
A condition in which too little light reaches the film, producing a thin negative, a dark slide, or a muddy-looking print.


Off-The-Film Metering
A meter which determines exposure by reading light reflected from the film during picture-taking.

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