Forums › Forums › Get Technical › Farktography tech talk › Practice Makes Better, Misc. Questions, Etc. › Reply To: Practice Makes Better, Misc. Questions, Etc.
October 14, 2006 at 3:33 pm
#5901
Participant
The scientific answer ain’t too bad. The F-stop is the ratio of the focal to the diameter of the opening. If you double the focal length (zoom in) you double the F-stop. Wiki has an nice article:
http://en.wikipedia.org/wiki/F-number
But really, just remember, as zoom in, you cut the amount of light you are receiving and thus the F-stop number increases.