A case study for quantifying the benefits of coordinated actuated traffic signal systems provided cost estimates for upgrading a 2.4 mile arterial segment on Route 17 in Gloucester, Virginia from a non-coordinated system to a coordinated system. The net present value over 10 years for the system maintenance costs is $1,621.60 per year for the non-coordinated system and $2,434.40 per year for the coordinated system.
Eyepieces have focal lengths, too â 25- or 10-mm, for example. To calculate the magnification, simply divide the focal length of the scope by that of the eyepiece. A 2000-mm focal length scope used with a 25-mm eyepiece will therefore deliver 2000/25 = 80 power (or 80x).
Thanks everyone. If I understand correctly, magnification refers to the image size at the film plane which is the same regardless of whether the camera is 35mm or digital. The field of view depends on the focal length and the size of the negative or sensor. Therefore, a 100mm lens on a digital camera with a 1.5X crop factor will have the same field of view as a 150mm lens on a 35mm camera, but the two lenses will not produce the same magnification (at the film plane).