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<blockquote data-quote="nickt" data-source="post: 236631" data-attributes="member: 4923">FX=full frame=35mm film equivalent size.DX=crop sensor, it is a smaller sensor.FX can be used on either camera. DX should be used only on a DX camera although there are provisions to use these lenses on a FX camera. In that case, you are not getting the most out of your full frame fx camera. An FX lens is just designed to produce an image that covers the larger sensor. It works fine on the smaller sensor. The dx lens can be made more inexpensively because it only needs to cover the smaller sensor. It is generally lighter in weight. Weight might be a consideration for you. A 70-300 fx lens can feel pretty heavy especially on a smaller body like the d3100. Many would expect better quality from an FX lens. The reason being that lenses are usually less good at the edges. When a FX lens is used on a crop sensor, the edges of the image fall outside the sensor area, so in effect, you are using only the hopefully better center portion of the image.</blockquote>

[QUOTE="nickt, post: 236631, member: 4923"] FX=full frame=35mm film equivalent size. DX=crop sensor, it is a smaller sensor. FX can be used on either camera. DX should be used only on a DX camera although there are provisions to use these lenses on a FX camera. In that case, you are not getting the most out of your full frame fx camera. An FX lens is just designed to produce an image that covers the larger sensor. It works fine on the smaller sensor. The dx lens can be made more inexpensively because it only needs to cover the smaller sensor. It is generally lighter in weight. Weight might be a consideration for you. A 70-300 fx lens can feel pretty heavy especially on a smaller body like the d3100. Many would expect better quality from an FX lens. The reason being that lenses are usually less good at the edges. When a FX lens is used on a crop sensor, the edges of the image fall outside the sensor area, so in effect, you are using only the hopefully better center portion of the image. [/QUOTE]

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