Archived posting to the Leica Users Group, 2002/07/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Tina Manley wrote: > LUGnuts: > > Here is something that turned up on the PhotoPro list today: > > "All digital cameras are very sensitive to heat; the hotter the chip the > more noise you'll have in the image." > > Does anybody know anything about this? Both the Digilux and the Lumix get > hot when you use them for any length of time. > > Tina They are probably talking about "dark current". I think that is not too great an issue in consumer CCD based digital camersa. It is an issue in astronomical instruments. A brief description of dark current can be found here: www.roper.co.jp/Html/CCD%20primer It's basically just the migration of electrons into the CCD cells. Since they are not the product of photos striking the CCD they are noise in your picture. Dennis - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html