The 28-105 f/3.5-4.5D is an excellent all-round lens. It's desirable to use with a full-frame camera, but it also works well with a Dx body. The 3.75x zoom range is sufficient for most situations and the additional 1:2 macro capability makes this lens exceptionally valuable. Not to mention that it's incredibly sharp at all available apertures. For field work I carry 17-35, 28-70 and 70-200 lenses (all f/2.8) but for easy hanging of the lens I use 28-105 f/3.5. . . . . bgs.
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