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Terms / Focal Length Printer friendly version Email page link to a friend Focal Length The length of the effective optical path of a telescope or eyepiece (the distance from the main mirror or lens where the light is gathered to the point where the prime focus image is formed). Typically expressed in millimeters. How To Pick A Telescope . . . | Telescopes | Eyepieces | Microscopes | Binoculars | Accessories | Terms | FAQ |  Terms of Sale | Privacy Policy | Fine Print Toll-Free Telephone: 800-422-7876 Alternate Telephone: 405-364-0858 24 Hour Fax Line: 405-447-3337 Telephone Hours: Monday-Friday 8 AM - 9 PM CST Saturday Noon - 5 PM CST Store Hours: Monday-Friday 9 AM - 5 PM CST Saturday Noon - 5 PM CST First Telescope 680 S.W. 24th Ave. Norman, OK, 73069 © 2012 by Ad-Libs Advertising, Inc. All rights reserved