35mm 1.8 DX or 50mm 1.8 FX for a D5100
The wife has green lighted me to purchase one of these two lenses. Without dispute they both appear to be great lenses but I have been unable to get one question answered from all my research.
For the purpose of my question I will use numbers easier to work with.
The DX lens is made to pass through an image of 3/4" that matches the size of the 3/4" (cropped) sensor. The FX lens lets through an image of 1" but the sensor is only 3/4" so the outer 1/4" is physically cropped off. Understanding this what I want to know is the optical image that comes through to my eyepiece going to show me for than what can be imaged (FX) or will the image in the optical viewfinder match what will actually be photographed (DX) and not show the additional 1/4" that will be cropped out due to sensor size?
I will eventually go to FX so I'm thinking I would like to do an FX lens. However, if the view I see in the viewfinder will be cropped out in part by the sensor that would make my pictures inconsistent. I do understand that the DX lens will go on an FX body and the camera will shoot in DX mode.
The wife has green lighted me to purchase one of these two lenses. Without dispute they both appear to be great lenses but I have been unable to get one question answered from all my research.
For the purpose of my question I will use numbers easier to work with.
The DX lens is made to pass through an image of 3/4" that matches the size of the 3/4" (cropped) sensor. The FX lens lets through an image of 1" but the sensor is only 3/4" so the outer 1/4" is physically cropped off. Understanding this what I want to know is the optical image that comes through to my eyepiece going to show me for than what can be imaged (FX) or will the image in the optical viewfinder match what will actually be photographed (DX) and not show the additional 1/4" that will be cropped out due to sensor size?
I will eventually go to FX so I'm thinking I would like to do an FX lens. However, if the view I see in the viewfinder will be cropped out in part by the sensor that would make my pictures inconsistent. I do understand that the DX lens will go on an FX body and the camera will shoot in DX mode.