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<blockquote data-quote="WayneF" data-source="post: 476670" data-attributes="member: 12496">The focal length of any lens is simply what it is... At any one zoom setting, it can have only one focal length.&nbsp; Which is the distance behind it where that lens focuses.&nbsp; No matter which body you put it on, the lens does not change.&nbsp;&nbsp; What might change is the sensor size in that body. The sensor size captures the &quot;field of view&quot; that is seen behind the lens.&nbsp; A smaller field of view on a smaller sensor can make it &quot;look as if&quot; it had been a longer lens on a larger sensor, but of course the lens is always still the same lens.&nbsp; The smaller sensor simply &quot;crops&quot; that view smaller, &quot;as if it were&quot; the view from a longer lens on a larger sensor (hence crop factor, hence equivalent focal length).See <a href="http://www.scantips.com/lights/cropfactor.html" target="_blank">Camera Sensor Crop Factor and Equivalent Lens Focal Length</a></blockquote>

[QUOTE="WayneF, post: 476670, member: 12496"] The focal length of any lens is simply what it is... At any one zoom setting, it can have only one focal length. Which is the distance behind it where that lens focuses. No matter which body you put it on, the lens does not change. What might change is the sensor size in that body. The sensor size captures the "field of view" that is seen behind the lens. A smaller field of view on a smaller sensor can make it "look as if" it had been a longer lens on a larger sensor, but of course the lens is always still the same lens. The smaller sensor simply "crops" that view smaller, "as if it were" the view from a longer lens on a larger sensor (hence crop factor, hence equivalent focal length). See [url=http://www.scantips.com/lights/cropfactor.html]Camera Sensor Crop Factor and Equivalent Lens Focal Length[/url] [/QUOTE]

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