[at-l] Idea for WOW pic on AT

[ryan@xxxxxxxx (Ryan K. Brooks)]

Jim Bullard wrote:

> Film records whatever light shines on it (within the limits of it's
> latitude) for as long as it shines on it. One of the limitations of
> digital
> is that the sensors (at least those used in consumer cameras) don't
> "remember" light over long periods of time so exposure isn't cumulative
> like it is with film. Many of the photos on AOPD are digital (all of them
> from the Hubble telescope and other space based images) but I think they
> must be compiling repeated exposures or computer enhancing them. Any
> astronomers out there who know how they do that digitally?


Yes,  we often take a series of digital frames and add them together.
Say thirty, 1 minute exposures- software adds the exposures together and
does other fancy image processing stuff  (do a google on CCD
astrophotography).

-Ryan