Does Focal Length Change the DoF?
Before we get any 'yes it does' or 'no it doesn't' responses and before anyone reads my article, the best, most well written article I have found on this subject, should be read. You can read the article here:
So, those who believed that for amateur photographers, generally the focal length changed depth of field, before reading the above article, you can now stand down. If you couldn't be bothered to read the article well, I've kindly reproduced the important section regarding this subject just for you:
As far as I am concerned, well done Cambridge in Colour for finally putting this to bed, case closed.