Why fx or dx

What is Tack Sharp? Can I use a Sigma teleconverter on a Nikon lens? Why do you seem to be so negative about teleconverters? How do I stack teleconverters? What About Tripod Specs? What Causes Card Errors? Why can't I find your works in bookstores? Why can't I find your works in the Kindle Nook store? Are all of your older Complete Guides still available? Do you ever update your works?

What do your books work on? Can I copy the eBook file to my other computers? Why were some eBooks supplied on a CD? Understanding the AF-P Lenses ». Here are a few things you need to know: Nikon refers to digital cameras that have the same size sensor as film as FX. Since then we've gotten more. Nikon refers to digital cameras that have a smaller-than-film sensor as DX.

The FX frame is 1. The Z50 mirrorless camera is also DX. Lenses are designed with an imaging circle that covers a particular capture area, either FX or DX. All Nikkor lenses prior to the introduction of the D1 other than the ones for the short-lived APS film bodies have an imaging circle that covers the FX sensor size.

Lenses introduced after the introduction of the D1 that are marked DX have an imaging circle that covers the DX sensor size, though some of those may also cover the FX sensor size at certain focal lengths. Focal length is focal length. Both DX and FX lenses are marked with their actual focal length. That's because serious photographers may need to use the actual focal length in calculations, such as for depth of field.

Angle of view is different for the same focal length on DX and FX. But the angle of view covered for the scene being photographed is smaller on the DX camera, as the sensor is smaller. Sometimes for convenience we cite equivalent focal lengths. Indeed, just divide the actual FX focal length by 1.

Thus, if you use a 28mm lens on an FX camera and want to shoot the same angle of view on a DX body, you need an 18mm lens.

We multiply in this case because the DX sensor is cropping the angle of view compared to the larger FX sensor. Again, the 1. If you want more accurate numbers and the exact horizontal, vertical, and diagonal angle of views for all the lens sizes for DX, you'll find them in my DSLR books.

This provides mm on the DX body degrees down to 78 degrees. But that lens also manages to cover the full FX frame from mm, so I have my degrees down to 84 degrees for FX, too. This new lens gives me 84 degrees down to 34 degrees on the FX body, and 78 degrees down to 23 degrees on the DX body. Yes, FX camera bodies and lenses are full frame! The FX sensor, with more "light gathering" area, offers higher sensitivity and, generally, lower noise.

There is, of course, no crop factor present with the FX sensor with an FX or full frame lens. And here's why. Each lens is designed to cast an image circle on the camera's sensor. The circle cast by a DX lens is smaller and corresponds to the size of a DX sensor. Non-DX lenses cast a larger image circle corresponding to an FX-format sensor. On an FX-format camera with a DX lens mounted, the camera will automatically engage its built-in DX crop mode, thus recording an image only from the center section of the sensor.

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