Hi Andrew
On the ImagesPlus Group, a lot of owner's of the 20Da have been complaining of getting a light and dark striped effect on some of their shot's, has been dubbed the "Dark River Effect". I am not sure of the details as it apparently only effects that particular model.
I will go back through the archives and have a look if you like and see if any work-arounds have been found and post them if you want.
I havn't taken that much notice of the problem because I have a 350D and for some reason it is not affected.
Cheers
JohnG
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