Why does nikon....

Started May 28, 2013 | Discussions thread
Terry Vickers
Regular MemberPosts: 332Gear list
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Re: Why does nikon....
In reply to davidib17, May 28, 2013

davidib17 wrote:

I was talking about what the image actually comes out to look like, not what the focal length of the lens is. Of course a DX 35mm is an actual 35mm, but that isn't practical or useful information at all. Who cares what the focal length is if the picture that it takes is no where near that?

Nowhere near what? You are conflating 35mm focal length with Aov. It is simply a convention to associate a lens' focal length with the Aov of a 35mm image plane. It's just a commonly understood reference.

As others have pointed out the full frame and medium frame image planes give a different angle of view as do smaller sensor cameras. You'll notice the nomenclature always has the word equivalent if referencing the image on a 35mm image plane.

Aov is a function of sensor size and focal length. The 35mm or whatever denomination is useless to determine Aov without the image plane dimensions. To talk about zoom level you need to say what the image is being projected on to.

 Terry Vickers's gear list:Terry Vickers's gear list
Nikon D3100 Nikon D7000 Nikon D5200 Nikon AF-S DX Nikkor 55-200mm f/4-5.6G VR Nikon AF-S DX Nikkor 18-55mm f/3.5-5.6G VR +7 more
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