> Focal length. f/l, not f/1. :)
The term "focal length," at least according to my standard references (_The Focal Encyclopedia of Photography_ and _The ICP Encyclopedia of Photography_), should not be abbreviated. Its symbol is � (stylized or italic f, in case it doesn't come through ascii) in optical formulae (cf. Sidney Ray, _Applied Photographic Optics_). Certainly the woeful "f/l" should NOT be used, as it is almost certain to cause confusion. --Mike
