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<blockquote data-quote="Mike D90" data-source="post: 229685" data-attributes="member: 17556">Trying to get this in my head.&nbsp; Ok, so I now understand there is no difference in the angle or focal length between FX and DX lenses.&nbsp; The difference is in the sensor size of the camera.&nbsp; I also understand the crop factor of the smaller sensor and this happens in-camera.What I need to absolutely understand is what happens through the lens or through the viewfinder.&nbsp; Is the image I am seeing, inside the viewfinder, the same image that is going onto my sensor (other than the fact that the D90 is a 96% view not 100%) when I am using an FX lens??&nbsp; I might could ask this another way.&nbsp; Is the mirror and viewfinder of my D90 the same representation of the image that is on my CCD?So what makes a DX lens different?&nbsp; What does it do to the light or image that is coming through the glass and onto the sensor that makes it a DX lens?&nbsp; I have read about the smaller &quot;circle&quot; projected onto the sensor but I do not understand exactly why there is a DX lens at all.&nbsp; If I want a 10mm wide angle image capture of a tall building from 1/2 mile away, taken with my D90 camera, to look exactly like a 10mm wide angle image capture, from an FX camera at the same distance to building, what does it take to capture that same angle and perspective?&nbsp; Obviously there is something different going on with the DX lens that allows that to happen.</blockquote>

[QUOTE="Mike D90, post: 229685, member: 17556"] Trying to get this in my head. Ok, so I now understand there is no difference in the angle or focal length between FX and DX lenses. The difference is in the sensor size of the camera. I also understand the crop factor of the smaller sensor and this happens[I] in-camera[/I]. What I need to absolutely understand is what happens through the lens or through the viewfinder. Is the image I am seeing, inside the viewfinder, the same image that is going onto my sensor (other than the fact that the D90 is a 96% view not 100%) when I am using an FX lens?? I might could ask this another way. Is the mirror and viewfinder of my D90 the same representation of the image that is on my CCD? So what makes a DX lens different? What does it do to the light or image that is coming through the glass and onto the sensor that makes it a DX lens? I have read about the smaller "circle" projected onto the sensor but I do not understand exactly why there is a DX lens at all. If I want a 10mm wide angle image capture of a tall building from 1/2 mile away, taken with my D90 camera, to look exactly like a 10mm wide angle image capture, from an FX camera at the same distance to building, what does it take to capture that same angle and perspective? Obviously there is something different going on with the DX lens that allows that to happen. [/QUOTE]

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