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Nikon 16-85mm f/3.5-5.6G AF-S VS Nikon 17-55mm f/2.8G ED-IF AF-S
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<blockquote data-quote="WayneF" data-source="post: 173607" data-attributes="member: 12496"><p>I wish I had thought to mention the advantages of a f/2.8 pro lens. Probably few of us are ever interested in actually shooting at f/2.8. However (seen in the lens test link before), lenses typically suffer substantial vignetting (dark corners) at widest apertures - maybe as much as a full stop of light falloff in the corners at widest apeture. Also typically more distortion, and also less sharpness out to the edges of the frame (at widest apertures). Wide apertures simply use a wider extent of the glass diameter, harder (and more expensive) to correct away from center.</p><p></p><p>So what f/2.8 really buys us is the ability (like when using bounce flash) to shoot at f/4 or f/5.6 (for the available flash power), but still be stopped down one or two stops, instead of wide open if the lens only goes to f/4 or f/5.6. IMO, this is the usual advantage of a f/2.8 lens. And it is not insignificant, but it does cost dollars.</p><p></p><p>Outdoors in bright sun (at f/8 or f/11) there would be much less difference, however more dollars can still buy a slight amount of greater sharpness.</p></blockquote><p></p>
[QUOTE="WayneF, post: 173607, member: 12496"] I wish I had thought to mention the advantages of a f/2.8 pro lens. Probably few of us are ever interested in actually shooting at f/2.8. However (seen in the lens test link before), lenses typically suffer substantial vignetting (dark corners) at widest apertures - maybe as much as a full stop of light falloff in the corners at widest apeture. Also typically more distortion, and also less sharpness out to the edges of the frame (at widest apertures). Wide apertures simply use a wider extent of the glass diameter, harder (and more expensive) to correct away from center. So what f/2.8 really buys us is the ability (like when using bounce flash) to shoot at f/4 or f/5.6 (for the available flash power), but still be stopped down one or two stops, instead of wide open if the lens only goes to f/4 or f/5.6. IMO, this is the usual advantage of a f/2.8 lens. And it is not insignificant, but it does cost dollars. Outdoors in bright sun (at f/8 or f/11) there would be much less difference, however more dollars can still buy a slight amount of greater sharpness. [/QUOTE]
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Nikon 16-85mm f/3.5-5.6G AF-S VS Nikon 17-55mm f/2.8G ED-IF AF-S
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