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Why non-DX Nikon lens 50mm f/1.8D 50mm camera actually DX?
I have a Nikon D80 digital SLR camera that is not full frame (FX), but rather, DX, and I'm using the DX 18-135 mm lens kit. Also I have a nikon 50mm f/1.8D, which is supposed to be 50 mm camera FX, as is not specifically for DX cameras (not a DX lens separated from the same variety). The goal I have is exactly this: http://www.amazon.com/Nikon-50mm-Nikkor-Digital-Cameras/dp/B00005LEN4/ Critics also say that this goal effectively is 75 mm for use on DX cameras. I had always assumed that my goal was actually 75 mm, while the shooting. But yesterday I decided to compare my two lenses: I shot the same scene with the two focal lengths of 50 and 75mm lens with my team, then fired my focal length lens of 50mm. To my surprise, the image of the 50 mm lens was exactly the same with the 50 mm lens on my computer, not the 75 mm. So I'm completely astonished, why is this so?
Their results are as expected. A 50mm focal length is 50 mm in all cameras regardless of the size the sensor. The focal length is an optical specification. What are you thinking about is the field of vision that takes into account the focal length and size of sensor. In an FX camera (sensor of the same area as a frame of 35mm film, which is a crop factor of 1.0), a 50mm lens has a horizontal field of view around 40 degrees. On a DX camera (crop factor = 1.5 x), a 50mm lens has a horizontal field of view of about 27 degrees or the equivalent of what a 75mm lens on a camera is FX. The key word here is "equivalent". He still has a focal length of 50mm, is only the projected image the sensor is clipped compared with a total sensor size. Perhaps these articles will clarify what I'm throwing up … http://en.wikipedia.org/wiki/Crop_factor http://www.tutorial9.net/tutorials/photography-tutorials/crop-factor/ You can use all the camera lenses DX FX without any problems. Using a DX lens on FX camera vignetting will, however, Nikon cameras will detect and use a small area the equivalent of the sensor to a DX sensor size. Fairly difficult, these people Nikon. The difference between DX and FX lenses is the projection area. Using his first 50 mm nominal FX in DX body will give you the sweetest portion of the lens (central area) which means fewer bullets and less chromatic aberrations.
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