Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site inuxe.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxj!ihnp4!inuxc!inuxe!rrm From: rrm@inuxe.UUCP (Ron Meyer) Newsgroups: net.astro Subject: CCDs in astronomy Message-ID: <656@inuxe.UUCP> Date: Wed, 19-Sep-84 12:22:07 EDT Article-I.D.: inuxe.656 Posted: Wed Sep 19 12:22:07 1984 Date-Received: Tue, 25-Sep-84 09:24:04 EDT Organization: AT&T Consumer Products Div., Indianapolis Lines: 15 To make a long story short, the quantum efficiency of a CCD is around 60 to 90 percent (depending upon the wavelength of observation) compared to about 1 percent of film, i.e. CCD's have a greater sensitivity to light than film. Also, CCD's do not have the problem of reciprocity failure that film does. There sensitivity to light remains constant during the entire exposure thereby allowing a shorter length exposure to "photograph" an object with a CCD. There are many other advantages of using CCD's (plus many disadvantages) insteadof film, but these are two of the "biggies" Ron Meyer inuxe!rrm Secretary-Indiana Astronomical Society