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Van de Nikon-site gepikt. Moest er nog verwarring zijn i.v.m. het verschil in lens coverage.
Focal Length and Picture Angle
When Nikkor lenses originally designed for the 35mm (135) format are used on the Nikon digital format, many people believe that the lens' focal length is increased by a factor of 1.5 - for example, the 12-24mm lens would become an 18-36mm lens. Technically, that is not correct. In fact, there is no change of focal length as you switch the lens from one format to the other. The actual change is that the picture angle of the lens is narrowed on the digital format because that format is smaller in relation to the lens' image circle projected onto the sensor. Focal length and reproduction ratio remain constant for the comparable viewed portions of the image. It is only the picture angle that changes.
The new DX Nikkor lens' true focal length is 12-24mm with a picture angle that will vary from 99° at 12mm to 61° at 24mm.
The combination of reduced picture angle and a smaller image circle have enabled the creation of compact, lightweight ultra-wideangle DX Nikkor lenses.
Groetjes,
Pol.
Van de Nikon-site gepikt. Moest er nog verwarring zijn i.v.m. het verschil in lens coverage.
Focal Length and Picture Angle
When Nikkor lenses originally designed for the 35mm (135) format are used on the Nikon digital format, many people believe that the lens' focal length is increased by a factor of 1.5 - for example, the 12-24mm lens would become an 18-36mm lens. Technically, that is not correct. In fact, there is no change of focal length as you switch the lens from one format to the other. The actual change is that the picture angle of the lens is narrowed on the digital format because that format is smaller in relation to the lens' image circle projected onto the sensor. Focal length and reproduction ratio remain constant for the comparable viewed portions of the image. It is only the picture angle that changes.
The new DX Nikkor lens' true focal length is 12-24mm with a picture angle that will vary from 99° at 12mm to 61° at 24mm.
The combination of reduced picture angle and a smaller image circle have enabled the creation of compact, lightweight ultra-wideangle DX Nikkor lenses.
Groetjes,
Pol.