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Message: <blockquote data-quote="PaulWog" data-source="post: 317653" data-attributes="member: 25930">It may have been stated earlier, but here's where I think your confusion may be at:A larger sensor takes in a greater amount of light because it's larger. The larger your format, the larger your lenses get. So, a fast aperture lens for full frame might be a bit larger than a fast aperture lens for a crop sensor camera. Letting in more light doesn't inherently mean more detail, more dynamic range, etc, etc. Simplified, aperture is all you really need to look at for your practical applications: An f1.8 lens that operates on FX, when put on DX, is still an f1.8 lens. It lets the same amount of light in.</blockquote>