> When I first got my istD I was very worried about the 3-5 hot pixels, some > red, some purple, one blue, that tended to turn up in longish exposures. > And the red pixel that showed up in 80% of my exposures at the same > position. Well, after about a month, I completely got over the hot-pixel > phenomenon. It's nothing to be worried about, and it's nothing that can be > done away with. You know, I did the whole 15 second exposure deal with the > lens cap on in an unlit room, and yes there are hot pixels that show up in > quantities similar to what you posted... Thats also at 15 seconds and with > no subject matter, so I can only assume that it doesn't really apply to the > real world, unless taking pictures of black emptiness happens to be your > game...
> Dust causes me more problems than hot pixels do, in fact, hot pixels are the > best kind of flaw, they're in the same place every time, so I know where to > look by now, and the color signature is usually very easy to pick out. And > if it's not very easy to pick out, well, then it must not be very easy to > pick out, so why worry?? > > > > -el gringo Thanks for your response. The hot pixels at 1 second and longer exposures don't bother me at all; they're to be expected. The hot pixels above 1/4 of a second, the point at which noise reduction kicks in, bother me more; ie when I'm seeing 10-15 hot pixels, many of them clustered together, at 1/90th of a second. How often do YOU shoot at that speed? My interest is both professional (my day job below, and the prior-mentioned image sensor article I'm working on) and personal. And of course you've got a valid point on hot pixels-vs-dust This week I plan to run numbers on my Kodak DX6490 digital point-and-shoot camera, and my wife's DX6340, too ============================== Brian Dipert Technical Editor: Mass Storage, Memory, Multimedia, PC Core Logic and Peripherals, and Programmable Logic EDN Magazine: http://www.edn.com 5000 V Street Sacramento, CA 95817 (916) 454-5242 (voice), (617) 558-4470 (fax) mailto:[EMAIL PROTECTED] Visit me at http://www.bdipert.com
