Replying to So I'm going to the grand canyon

And I only have a 50mm for my D70 at I would like something wider so I can take portrait shots. I have been looking around on ebay at some filter type things that I can screw on my 50.

Example 1: http://tinyurl.com/5uwrx8e

Would this fit the bill without distorting or vignetting? or could I go cheaper?

Example 2: http://tinyurl.com/66a578a

Will the picture quality get all screwed up and look shitty? and also it says the filter is a .45, does that mean it will make my 50 into a 22?

thanks ns