| Glossary: |
| Aperture - The f-stop, or the size of the shutter opening. |
| Close Down - reduce the amount of light hitting the film by closing the aperture to a smaller opening, or reducing the amount of time the shutter is open |
| F-stop - Same as aperture. |
| F-number - The number associated with the f-stop. A large number is a tiny opening A small number is a large opening) |
| Open Up - increase the amount of light hitting the film by opening the aperture to a larger opening, or increasing the amount of time the shutter is open |
| Reciprocity - Well, that's what the article is on... |
| Reciprocity Failure - When exposure TIME reaches a certain point (either VERY long or VERY short), the reciprocity relationship fails, and more exposure TIME is needed. |
| Shutter Speed - The amount of time the shutter is open. |
| Stop - A step up or down in the exposure. ie 1/125 is one stop more light than 1/250 f11 is one stop more light than f16 |
| Stop Down - Reduce the amount of light hitting the film by closing the aperture to a smaller opening, or reducing the amount of time the shutter is open. |
| Wide Open - The aperture is as large as it can get. If your lense is a 400mmf5.6, then at a setting of f5.6 your lense is wide open |
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