I'm not sure if this topic has been discussed before so I'm going to open it here.
In my photostream http://www.flickr.com/photos/kadeyimaging/ There are a number of photos that have striations in certain areas. The notable ones are "road to Chart farm" and "cloud." Chart farm has the striations around the light source and Cloud has them in the sky around the cloud.
Chart farm was taken with a D300s 50mm prime at f1.8 and ISO 400.
Cloud was taken with a D300s Sigma 18-200 at 80mm and f5.3 and ISO 100.
I thought that these were due to my processing on a non-HD computer - Chart farm, but Cloud was processed in HD.
I have gone to the RAW files and reverted them and I have found that the striations exist even in the RAW as it came from the Camera.
What causes this effect, what are the solutions?