Does anyone here have the Canon EF 70-300mm f/4.5-5.6 DO IS USM Lens? (The Fresnel lens.) With its relatively small size it looks like it would be a good travel lens but all the reviews say that it is soft. Reviews say that the Canon EF 70-300mm L is sharper but it is bigger. (Cost is about the same.) The Canon EF 70-300mm f/4.5-5.6 DO IS USM Lens appeals to me because it is short and it is not white like some of the telescopic L lenses.