Why does nikon....

Started May 28, 2013 | Discussions thread
Lance B Forum Pro • Posts: 30,616
You're mixing up FOV with focal length

davidib17 wrote:

I agree. A 'normal' full frame lens should only specify the focal length. It can actually be used as that focal length on a bigger sensor.

A 'DX' lens can never be used at the focal length, or field of view, it is advertised to use, even on a full frame. So knowing focal length in that case really doesn't have any practical use. It really isn't that complicated people.

I'm not trying to argue that Nikon should change it, I'm just questioning the logic that caused them to start out with a system that makes so little sense.

You're mixing up focal length with FOV.

35mm on Olympus's 4/3rds system is still 35mm

35mm on DX is still 35mm

35mm on FX is still 35mm

35mm of MF (Medium Format) is still 35mm

However, the FOV changes with the differing formats

35mm on Olympus's 4/3rds system has a 34 degrees FOV

35mm on DX has a 44 degree FOV

35mm on FX has a 62 degree FOV.

35mm on MF depends on the size on the Medium Format as there are a number of sensor sizes.

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