Karl, By golly you did! Great minds quote alike. AZ LOOKAROUND - Since 1978 Build a 120/35mm Lookaround! The Lookaround E-Book 5ed. http://www.panoramacamera.us > -------- Original Message -------- > Subject: [SPAM] Re: 'Digital lenses" > From: karl shah-jenner <shahjen@xxxxxxxxxxxx> > Date: Fri, October 16, 2009 9:55 am > To: List for Photo/Imaging Educators - Professionals - Students > <photoforum@xxxxxxxxxxxxxxxxxx> > Alan writes: > Jim, > Thanks for the authoritative URL. Its salient point for all below: > QUOTE > Application > When this experiment was written, back in 1972, telecentric lens systems > were considered somewhat "exotic". But now (2006) they are finding new > applications in astronomy, machine imaging applications and industrial > quality control measurements. Imaging arrays are generally small > compared to the area of photographic film images, and their performance > is very much improved when all light rays impinge normally > (perpendicular to) the array surface. This is due to the three > dimensional nature of the sensor elements, and the fact that some > incorporate tiny color filters above each sensor element. The entire > sensor array is smaller than the diameter of the typical film camera > lens. So it is quite practical to use a system telecentric on the image > side to ensure that condition of normal incidence. Now such a system is > even used in digital cameras (for example the Nikon Coolpix). > END QUOTE > ..that is exactly what I quoted..
