Why buy multiple lenses to cover a range of focal lengths instead of one zoom with a larger range?
Speaking very generally, smaller range zoom lenses usually have better performing optics than larger range zoom lenses do, and fixed focal length lenses are better yet. They tend to be less prone to such things as vignetting, pincushion distortion, barrel distortion, chromatic aberration, flare, poor resolving power, poor contrast, color casts, and so forth.
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