New tamron worlds longest x factor

They have extended the 18-200 to 250

http://stock-photo.blogspot.com/2006/09/tamron-af-di-ii-18-250-macro-walk.html

I'm sure it's fine for snapshots, but that long a zoom range must be nearly impossible to control for a lens designer. Look for reviews or images before you go off and get a bazooka like that