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If you need to correct distortion etc on certain lens have a look at this site:

http://www.northlight-images.co.uk/article_pages/dxo_raw1.html

I have tried the trial on the kit lens and it WORKS!!

Cheers

Chris PS get the trial version at:

http://www.dxo.com/en/photo/technology/default.php

Chris I looked at it and was impressed by its performance but not by its price. You have to pay for the filter for EACH lens and that adds up quick.