![]() What's more, similar to any instrument, there are various cameras for various aims. Also, changing the focal length will automatically change the composition of the frame.Ī camera is a tool used to accumulate light. None of this happens if you took the 50mm lens off the DX and put it on the FX. For example, changing the focal length changes the depth of field. Why is such a reference so important? It is not the focal length that changes, but the angle of view? Focal length affects a lot of things. Yes, they are closer, but not due to changing the focal length, but because a piece of a frame was cut out and stretched to a frame size of 35mm. It is like a comparison of a 10x15 photo printed from a 35mm image with a photo of the same size printed from DX images and it appears that objects are closer in the second print. After all, the cut piece from a frame is stretched to fill the entire screen. The focal length confusion arises from the illusion of approaching. Changing the focal length is equivalent to zooming in/out of an object, but you won't find any of that. And vice versa, if you are used to using a 50mm lens on a DX-camera, screwing it on the FX, the frame borders will move apart, and not the focal length will change. This will be what you see on a DX camera. That is, you need to cut out a piece of a picture from a 35mm frame. ![]() However, the focal length does not change! The viewing angle changes. The angle of view on a DX camera narrows in such a way as if you were looking through a lens with a focal length of 1.5 times on an FX camera, that is, about 50mm. This is where the confusion arises for many. But what, after all, do these sensors give us? In the case of Nikon, we get excellent compatibility with all Nikon lenses, save money, but what's the idea? The point is that a 35mm lens, for example, will have a narrower angle of view on a DX camera than on an FX camera.
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