Why does nikon....

Started May 28, 2013 | Discussions thread
Sunshine_boy
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Currency equivalent!...
In reply to davidib17, May 28, 2013

davidib17 wrote:

Manufacture DX lenses and give them a FX focal length, instead of the equivalent?

That's because the FX value is a universal constant regardless of the camera it is mounted on, as the other posters pointed out. All you need to know is the 'crop factor' of your camera/sensor and multiply it by the indicated FL. Crop factors vary. Nikon's DX factor is 1.5, Canon's is 1.6 etc. So, a 200mm lens would be 200mm on any FF cam, 300mm on a Nikon DX and 320mm on a Canon DX.

Look at it in the same way as specifying a 'value' of a house expressing it in US dollars without having to bother expressing it in half a dozen other major currencies... 

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