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Message: <blockquote data-quote="WayneF" data-source="post: 198645" data-attributes="member: 12496">If you used them for example for pictures of landscapes, there is not much difference between 40 and 50 mm (20% or 25%).   Both are mild telephoto on a DX camera.But the 40mm is a macro lens, and will focus as close as a couple of inches in front of the lens, like to magnify the head of a grasshopper in the frame.   Actual minimum focus is 6.5 inches, which is measured from the sensor plane mark near the rear edge of the top LCD, and this a couple inches in front of the lens.   Longer focal length macros allow same view a few inches farther from the subject (which becomes convenient).In contrast, the 50mm only focuses to 1.5 feet, which would work on a tabletop scene, but is still pretty far from the grasshopper.</blockquote>