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What is the difference between a wide angle lens vs. wide angle filter?

There are several 'filters' on ebay that just attach to the end of your lens. They are relatively cheap. (Like $40-50) Here's an example: http://cgi.ebay.com/WIDE-ANGLE-LENS-FISHEYE-CANON-EOS-DIGITAL-REBEL-XT-400D_W0QQitemZ200159672918QQihZ010QQcategoryZ106845QQssPageNameZWDVWQQrdZ1QQcmdZViewItem Then there are the actual lenses that range from $300-$4000. Like this: http://cgi.ebay.com/Canon-EF-20-35mm-f-2-8L-Lens_W0QQitemZ320165955825QQihZ011QQcategoryZ4687QQssPageNameZWDVWQQrdZ1QQcmdZViewItem I'm assuming that the cheaper one is lower quality, and causes vignetting. How big of a difference is there, and is there a wide angle lens that you could recommend for a beginner photographer with a Digital Rebel XTI?

Public Comments

1. Well, as you've seen, and correctly assumed the filters are definitely cheaper. With the cost of being lower, you can expect them to be lower quality optics and also also reduce the amount of light coming into the lens. This may make it more difficult to catch the image. If you're taking landscape shots, the low light issue isn't so much a big deal but if your taking pictures at a party, using natural light it may mean you don't get the shot. Lower quality optics means lower image quality too. Keep in mind that some of the most beautiful shots ever taken have been done using gear far inferior to what's available today. It's really all in the skills and eye of the photograper. Now if this is for someone who's just learning and wants to be a better photographer, then it can add a capability they may want to explore... cheaply for now and if they really want to take it further, the $50 is a cheap way to learn you want to persue it. On the otherhand, for me and my shooting style, I already know I enjoy wide angle photography and I would never buy one of the filters for myself. I actually purchased a Tokina 12-24mm ultrawide for ~$600 (with tax, etc.) my Nikon D70. HTH.
2. I have yet to encounter a name-brand wide-angle converter of decent quality, therefore I'd expect these to produce marginal results. You can expect a very noticeable decrease in contrast, sharpness (especially edge), overall IQ and an increase in chromatic aberration and fringing since most of these poor quality converters are uncoated. I would strongly recommend that you stay away from converters and macro filters even if you are an amateur photographer. They might seem tempting but they aren't even worth the price. Try to stick with primary lenses.