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Message: <blockquote data-quote="Disorderly" data-source="post: 79054" data-attributes="member: 10297"><p>Lens design involves compromises, and superzooms like the 18-300 have to make major compromises in image quality to get such a big range of focal lengths.  You would see them as distortions at different focal lengths (e.g. straight lines not being straight in your images), vignetting (differences in brightness at the corners vs. the center), soft focus away from the center, etc.  Some of these can be corrected easily in software.  Then there are operational differences, like maximum apertures that vary over the zoom range (that f/3.5-5.6 business).  And then there's bokeh, that quality that out of focus elements of your scene display.  Some lenses produce a pleasing bokeh, some don't.</p></blockquote><p></p>