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<blockquote data-quote="WayneF" data-source="post: 335267" data-attributes="member: 12496">DX is a smaller sensor, and yes, it is just about precropping the lens image to be smaller.&nbsp;&nbsp; Any &quot;reach out&quot; or telephoto effect is simply because then we must enlarge the smaller image more, and when same size again, it does give a telephoto effect.&nbsp; Any post cropping would give the same telephoto effect (when similarly enlarged, magnified).However, the DX sensor is built with more pixels in that smaller area.So a 24 megapixel D610 FX image cropped to be DX is only 10 megapixels.&nbsp;&nbsp; Any post cropping would be the same.&nbsp;&nbsp; A 24 megapixel D7100 DX image is 24 megapixels, in this smaller area.&nbsp; We are subsequently enlarging the lens image 50% more (degrading it more), but there is a noticeable pixel difference in the future enlargement capability.Otherwise, both pre and post croppings are the same cropping idea.&nbsp;&nbsp; It is a huge otherwise however, the DX sensor has more pixels remaining.</blockquote>

[QUOTE="WayneF, post: 335267, member: 12496"] DX is a smaller sensor, and yes, it is just about precropping the lens image to be smaller. Any "reach out" or telephoto effect is simply because then we must enlarge the smaller image more, and when same size again, it does give a telephoto effect. Any post cropping would give the same telephoto effect (when similarly enlarged, magnified). However, the DX sensor is built with more pixels in that smaller area. So a 24 megapixel D610 FX image cropped to be DX is only 10 megapixels. Any post cropping would be the same. A 24 megapixel D7100 DX image is 24 megapixels, in this smaller area. We are subsequently enlarging the lens image 50% more (degrading it more), but there is a noticeable pixel difference in the future enlargement capability. Otherwise, both pre and post croppings are the same cropping idea. It is a huge otherwise however, the DX sensor has more pixels remaining. [/QUOTE]

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