Photographer's Glossary

Meanings and explanations to common photography terminology.

Astromonical Twilight
This is when the center of the Sun is between 12 degrees and 18 degrees below the horizon. It sits between the complete darkness of night and nautical twilight.
Civil Twilight
This is when the center of the Sun is less than 6 degrees below the horizon. This is the period immediate before sunrise and after sunset.
Crepuscular
Relating to twilight, dim.
Cresent Moon
Phases where the moon is less than half illuminated.
Digital Negative (DNG)
An Adobe file format made publically availabe for the archival of the raw files generated by digital cameras.
Gibbous Moon
Phases where the moon is more than half illuminated.
Nautical Twilight
This is when the center of the Sun is between 6 degrees and 12 degrees below the horizon. It sits between astronomical twilight and civil twilight.
Parhelion
A sun dog (or sundog) or mock sun, meteorological name parhelion (plural parhelia), is an atmospheric phenomenon that consists of a bright spot to the left and/or right of the Sun. [Wikipedia]
Sastrugi
Parallel wavelike ridges caused by winds on the surface of hard snow. [Google]
Trade For Print
A common arrangment between a model and a photographer where the model provides their time in trade for a limited license to use some of the photos taken during the shoot. Also known as Time For Print, or TPP.
Waning Moon
Where the visible illumination of the moon is decreasing.
Waxing Moon
Where the visible illumination of the moon is increasing.