I have been thinking about getting my wife another lense. It has been my impression that any lense used on a digital format is multiplied by 1.5 then I check this http://www.tamron.com/lenses/prod/assets/pdfs/18_200_A014.pdf. What are they talking about 18mm is the same as 28mm in film on this lense ? Isn't that the opposite or there is a different standard on field of view angles from digital and film.