Box Brownie wrote in post #4093328
Been a while since I did long exposures but I am sure I recall a setting on my 350D - no doubt somewhere on all of the EOS dSLRs - for making "dark frame" subtraction' exposure this is intended to remove such hot pixels and reduce the noise found in long exposures ~ or am I totally off the wall with this understanding
Been a while since I did long exposures but I am sure I recall a setting on my 350D - no doubt somewhere on all of the EOS dSLRs - for making "dark frame" subtraction' exposure this is intended to remove such hot pixels and reduce the noise found in long exposures ~ or am I totally off the wall with this understanding
Yes, that's the Long Exposure Noise Reduction setting found in the custom function menu. Just as you say, it subtracts an image made with the shutter closed from the image you just took which removes the hot-pixels and the consistant thermal noise. The drawback is that your shot will take double the exposure time because of the the 'darkframe'. There are other ways to do this but this is the easiest.
This would certainly help the OP though I would suggest he try and get the camera replaced.
