I am considering buying a Sigma 10-20 mm F3.5 wide angle lens for my canon 550D, but not sure what the benefit would be compared to using the wide angle end of my existing Sigma F3.5-6.3 18-250 mm lens?
You're comparing ultra-wide versus "simply-" wide. It's as if you'd compare a 200mm tele to a 600mm one.
Those 8mm do in fact have a great significance, for example:
I do think this illustration is a tad exaggerated, but you get the feeling.
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