07-06-2013 01:11 AM
I'm getting a random issue with my 5D Mark III. I usually shoot in AV mode, RAW at ISO 100. I don't like to increase my ISO because I want to avoid high noise and plus I'm shooting in HDR. In dim lighting conditions when I have to lengthen the shutter speed and then view/process the dng images in Camera Raw, I get a mixed bag of results. Some images at 1/8 sec or 2 sec have the grainiest noise in the shadows, but then I'll have an image at 10 or 15 seconds and the image is smooth and sharp. I'm at my wit's end.
It also helps to know that I just bought a 16 - 35mm 2.8L lens and it's been working fine up until today when the autofocus went bust. Could it be a body issue or lens issue? I'm driving to Canon repair on Monday morning to drop off both lens and body. Any help or insight will help.
07-06-2013 01:32 AM
07-07-2013 01:50 AM
07-08-2013 05:32 PM
07-08-2013 06:36 PM
This was a raw file converted to a DNG and then I saved as a jpeg so the file wouldn't be too large. I did no modifications in raw (DNG rather) - it's as is.
I'm glad you said this because I will be upgrading to PS 6 very soon. so I'm hoping I don't have to deal with converting raw to DNG as part of my workflow anymore. Thanks so much for your interest.
07-08-2013 07:12 PM - edited 07-08-2013 07:15 PM
No problem. I'm curious too. I dig a little deeper into your Exif data and look at your processing values:
Tint = "+2"
Exposure = "+3.40"
Shadows = "0"
Brightness = "+71"
Contrast = "+19"
Saturation = "0"
Sharpness = "25"
LuminanceSmoothing = "0"
ColorNoiseReduction = "25"
ChromaticAberrationR = "0"
The exposure was pushed by 3.5 stop, and the brightness +71. That's a huge value. Yet Noise Reduction is set at ZERO. Thus, the result should have a lot of noise and banding noise as seen in your photo. I don't think there is something wrong with your camera. You may have development PRESET turn on by default.
07-08-2013 07:38 PM
That's interesting, I saw the +3.40 in raw as well, and I keep wondering why is it at that value when I auto bracketed it to be at +2? I'll look more into development preset as I have no clue as to what that is. I admit that I don't know a lot of the controls of the camera, so that could be an issue too.
07-11-2013 09:32 AM
This often happens if long exposure noise reduction settings are not set properly. For a 1/8th second shot, the noise reduction is not applied. For a 2 second shot, it is always good to apply noise reduction, even if ISO is low, just to be safe.
So if I was you, I'd just enable long exposure noise reduction to ON in all situations. That should solve the problem. Sensor heating also causes abnormal noise performance in some bodies. But that isn't an issue unless you have been shooting live for hours before.