Posted by Morris McClung on September 9, 2008 at 2:21 PM
Just looking for some input from 5d users. This was shot last Saturday from near Squaw Pass. It is only a 2 second exposure, and I haven't had a problem with this much noise yet. Wondering if other users could tell me if they use the noise reduction settings at this shutter speed, or not until longer exposures.
Posted by John Mumaw on September 9, 2008 at 2:45 PM
Actually, the 'noise reduction' feature for long exposures is a 'dark frame subtraction', where the camera's software maps hot pixels from the long exposure and eliminates them. It doesn't do a thing to reduce/eliminate noise.
Posted by Pam Colander on September 9, 2008 at 2:50 PM
I have found the noise reduction feature to be a detriment esp. with night shots. I don't use it. I use a layer of Neat image and adjust the opacity if needed.
Pam
Posted by Mel Ladewig on September 9, 2008 at 2:52 PM
Also with my Rebel XT, I've noticed some strange behavior at times regarding noise. Usually the sky is pretty smooth at ISO 100, but every now and then it looks like the camera was left at ISO 800. I've never figured out what is causing this.
Posted by Kevin Trinkner on September 9, 2008 at 4:30 PM
Mel, I've seen the same with my xti. Most of the time at ISO100 I'm fine, but once in a while it gets really noisy...
So using the built in noise reduction isn't worth it? I ask because when you have it on long exposure night shots become a real issue waiting between exposures for the reduction..
Posted by John Mumaw on September 9, 2008 at 5:27 PM
So using the built in noise reduction isn't worth it?
Sure it is, as long as you realize that what's happening is the elimination of hot pixels disclosed by the long exposure, and not any noise reduction.
If you want to take a long exposure without dealing with the camera's own mutually long exposed dark frame subtraction, you can always perform one with the lens cap on for the same length of time before or after the fact using PS or freeware, as outlined in this simple tutorial.
Posted by Nat Coalson on September 9, 2008 at 8:05 PM
I never use in-camera noise reduction either. Desktop software handles it much better. For anything beyond what Lightroom can do I use (and highly recommend) Noiseware
Posted by John Mumaw on September 9, 2008 at 8:31 PM
"In-camera noise reduction" on Canon DSLRs is an on chip circuit that can't be turned on and off, so one really has no choice in the matter.
Posted by Morris McClung on September 9, 2008 at 8:43 PM
Anyone want a 5d? I'm going back to film!
Just curious Nat. How many plug-ins do you use often?
Discussion
8 repliesPam
Mel, I've seen the same with my xti. Most of the time at ISO100 I'm fine, but once in a while it gets really noisy...
So using the built in noise reduction isn't worth it? I ask because when you have it on long exposure night shots become a real issue waiting between exposures for the reduction..
Sure it is, as long as you realize that what's happening is the elimination of hot pixels disclosed by the long exposure, and not any noise reduction.
If you want to take a long exposure without dealing with the camera's own mutually long exposed dark frame subtraction, you can always perform one with the lens cap on for the same length of time before or after the fact using PS or freeware, as outlined in this simple tutorial.
Just curious Nat. How many plug-ins do you use often?