A bit confused: ZS3 questions
Next, I saw one thread with a "how to" on putting a add on lens on this camera. What would be the purpose?
Same as any other camera - to expand its capabilities. Here's my thread on making an adapter. Although I show making an adapter for a telecon, the same steps cam be used for making one for a wide angle adapter - it just needs to be shorter: http://forums.dpreview.com/forums/readflat.asp?forum=1033&message=32058552
With a Nikon WC-E68 wide-angle adapter, the ZS3 goes from 25mm equivalent to 17mm. That's pretty wide for little expenditure.