Speed confuses me in Getting Started General Help and Advice Posted February 7, 2011 Does the speed relate to increased frequency of light captured in being interpreted by the brain? pfwffff I'm lost!Hi Daniel,The way I understand the 'speed' thing is that the 'speed' of a scope is related to the length of the light path between the objective lens / primary mirror and the focal point of a given aperture scope. ie:. In a short focal length 6inch scope the light reaches the focal point quicker after it passes the primary mirror or objective lens than it does in the same aperture scope with a longer focal length. Therefore it is known as a 'faster' scope than one with a longer focal length.If I've got this wrong then I'm sure someone will correct me.