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<blockquote data-quote="jwstl" data-source="post: 138476" data-attributes="member: 12977"><p>I think you might be confused about the differences in DX and FX lenses.</p><p>The Sigma 10-20 is a DX lens like the 18-55 but, regardless if it's FX or DX, it's still 15-30 equivalent on a DX camera. And the 18-55 is basically a 28-80. DX lenses are still labeled in length from the sensor and that doesn't change just because the sensor is smaller. So the 18-55 is actually 18-55mm from the sensor but it's smaller than 35mm film so there's the crop factor. In other words, DX lenses still have the crop factor. As for DX advantages, because they are designed to cover the smaller sensor they can be made smaller, lighter and less expensively.</p></blockquote><p></p>
[QUOTE="jwstl, post: 138476, member: 12977"] I think you might be confused about the differences in DX and FX lenses. The Sigma 10-20 is a DX lens like the 18-55 but, regardless if it's FX or DX, it's still 15-30 equivalent on a DX camera. And the 18-55 is basically a 28-80. DX lenses are still labeled in length from the sensor and that doesn't change just because the sensor is smaller. So the 18-55 is actually 18-55mm from the sensor but it's smaller than 35mm film so there's the crop factor. In other words, DX lenses still have the crop factor. As for DX advantages, because they are designed to cover the smaller sensor they can be made smaller, lighter and less expensively. [/QUOTE]
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