coolpix 990 - problems with long exposure (new URL)
I have recently had to take some images using a 4 or 8 second exposure. I'm getting poor results due to speckled dots all over the picture. Has anyone else had similar results with very long exposure times.
#1. "RE: coolpix 990 - problems with long exposure (new URL)" | In response to Reply # 0AlanC Basic MemberSun 10-Jun-01 01:45 PM
The noise you're seeing is what is normally referred to as 'hot pixels' and is common to all digital cameras to a greater or lesser degree. It typically shows up at exposures of 1 to 2 seconds or more.
There's an explanation of the different types of noise you can get in digital images at http://www.dpreview.com/learn/Glossary/Digital_Imaging/Noise_01.htm and details of a method to help reduce 'hot pixel' noise (assuming you have a copy of Photoshop or some other image editing software that implements layers) at http://www.dpreview.com/learn/key=noise+reduction