I believe the mm are effectively zooms / wide angle elements...
so the 18-55mm lens would not be able to zoom as well, but can take more wide angle shots.. and the 55-250mm has much more zoom but less wide angle...
Ask him what he wants it for and if he's got any existing lens?
Lens Focal Length*, Terminology, Typical Photography
Less than 21 mm, Extreme Wide Angle, Architecture
21-35 mm , Wide Angle , Landscape
35-70 mm , Normal, Street & Documentary
70-135 mm , Medium Telephoto, Portraiture
135-300+ mm , Telephoto , Sports, Bird & Wildlife
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Ninja text! For those who's easily amused
I can show you the woooorld!
I don't want to see it!
okay...
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