tag:blogger.com,1999:blog-16327517.post4497481351126375351..comments2024-03-26T19:19:35.144+00:00Comments on Eolake Stobblehouse thoughts: How lenses workEolake Stobblehousehttp://www.blogger.com/profile/07126147415891586345noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-16327517.post-30137994095143069892013-09-21T19:10:36.893+00:002013-09-21T19:10:36.893+00:00I didn't say it had to be a glass lens! :-)...I didn't say it had to be a glass lens! :-)<br /><br />Seems some flourites have almost no Chromatic abberation. <br />We may one day make a synthetic material which is entirely free of any abberation at all. <br />Or gather the light with a magnetic field, or what do I know? <br /><br />Or the "lens" is a 5-molecule thick film consisting of translucent nanobots which working together can make a super fast super-zoom weighing next to nothing. Perhaps it can even enhance the light almost noiselessly, so the entrance pupil can be very small. Eolake Stobblehousehttps://www.blogger.com/profile/07126147415891586345noreply@blogger.comtag:blogger.com,1999:blog-16327517.post-87349431260724104932013-09-21T18:13:57.232+00:002013-09-21T18:13:57.232+00:00But Eolake, I doubt you would want to shoot all yo...But Eolake, I doubt you would want to shoot all your pictures in "ideal" light! Since electromagnetic waves of different frequencies follow slightly different paths through the lens, a single lens will ALWAYS show some chromatic aberration (rainbow rings) ... unless you are using a fully monochromatic filter or lighting setup. Black-and-white film/sensors won't fix the problem, since the image is already messed up by the time it gets to the focal plane. You have to have a series of lenses, each one offsetting the aberrations from the others. Protecting these exacting design details is why the video is so broad and sketchy. If you don't believe me, try reassembling the lenses out of order next time you clean a lens assembly }:^))Ol' Bennoreply@blogger.com