Canon 550d lens recommendation for replacing the 18-55mm kit lens

Started May 15, 2012 | Discussions thread
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bakhtyar kurdi Contributing Member • Posts: 596
Re: Canon 550d lens recommendation for replacing the 18-55mm kit lens

Your comment regarding shooting wide open may not give best performance, is it best to increase the f-stop by a half as a general guide? i.e. for the 15-85 if i was shooting at 15 then the f-stop should be f4?

No,usually stopping down from the maximum aperture by 2 stops is the most lenses sweet spot, the 15-85 is 3.5 at 15mm, so stopping down to 5.6 or 7 gives the best sharpness, at 85mm it is 5.6, so stopping down two stops means f11.
but many lenses are really good at maximum aperture including your kit lens.

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