Why does nikon....

Started May 28, 2013 | Discussions thread
sshoihet
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Re: no such thing
In reply to Mako2011, May 28, 2013

Mako2011 wrote:

davidib17 wrote:

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

Because as sshoihet points out...the DX focal length of the 35mm f1.8DX lens is 35mm and not 50mm. There is no such thing as a DX equivalent focal length...there is a such thing though as a equivalent FOV.

What about when you shoot a DX lens on an FX camera, what happens then when you switch it to DX mode?  As you noted, only the AOV changes

Add to that too the fact that many DX lenses will work quite well on an FX sensor and cover the entire frame with little to no vignetting depending on the focal length and or aperture. eg the Sigma 8-16mm works quite well in FX mode at 15/16mm and is still quite good at 14mm.

http://www.dpreview.com/forums/thread/3206935?page=1

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