It's for me to not appear in a picture.Thanks for the answers Considering it is a digital camera, I'd consider it would be easier for you to modify the image after having taken it. Through the use of photo editing program like Photoshop, PaintShop Pro, or even Microsoft Photo Editor you can apply a blur affect to specific areas of the picture.
Whereas any hardware modifications to the camera could possibly resulting in damaging the lens or obscuring other areas of the picture. However if you still want to do it on cam, then messing with the focus is your best bet. try using manual focus and and set the shutter speed low. that should do the trick. else try shaking the camera. if all else fails try using a software and crop yourself out | 