09.23.09
expressing camera exposures in terms of ICAS
while preparing a title of the new waves deskart image (in the arts showcase area of this web site), i considered how a camera exposure measure of 0.000625 second could be expressed in terms of a day-decimal figure.
the range of exposure measures for photography can include a lot of decimals of the SI unit of time, and can also include many multiples of the unit of time.
thus, depending on the exposure specifications of a particular camera, and the types of exposures that a photographer might encounter while taking pictures, different decimal units might be used to express a measure of an exposure in terms of a whole number.
the choice of prefix or notation may also be determined by a particular comparison, or by a particular style guideline.
here are the calculations that i used to name the image:
- 1 tikochron = 0.864 s (AAT ICAS, SI)
- 0.000625 s = 0.00054 tik
- 0.00054 tikochron = 0.0054 microcron = 5.4 nanochron = 5400 picochron
- 0.000625 second = 0.625 millisecond = 625 microsecond = 625 000 nanosecond
Ron Stone,
communications consultant and publisher of enhanceability.com
