Here are 2 of the lenses i own i reveiwed, I'm no expert but i thought it may help more readers.
The posts have links to my Picasa albums were you can find rest of test shots.
Tamron 18-270 Di-II VC - CA$550
http://digital-photography-school.co...-di-ii-vc.html
Raynox MSN-505 Macro adapter US$ 95
http://digital-photography-school.co...est-shots.html