Distance Information
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Electronic Performance and Distance Information Each lens incorporates a Central Processing Unit (CPU) which works with the automatic operation of compatible Nikon AF SLR models, as well as with each camera's light meter including Matrix, ...
This system determines distance information by reading the current focussing distance from the lens. Canon did not incorporate a similar distance-data system in their flash technology until 2004, with the introduction of E-TTL II.
The hot shoe supports E-TTL II metering which uses distance information from the lens to calculate flash power. This works with all Canon lenses (although distance information is only provided by lenses with ring type USM motors).
D-Type NIKKOR Lens A NIKKOR lens that sends distance information to the microcomputer of a dedicated Nikon camera. D-type lenses can be distinguished by a model name in which the letter D follows the maximum f/number.
AF Nikkor lenses that send Distance Information to some of Nikon's top cameras, Used for 3D Color Matrix Metering or 3D Multi Sensor Balanced Fill Flash (with Nikon SB 27/SB 26/SB 25 Speedlight).
The metering results from the classic flash TTL metering is either ignored or at least less weighted. The distance information requires in-lens logic which needs to transfer the data to the camera so with older lenses you may not be able to take ...
We need to worry about how a lens works as part of a much larger system of live tracking autofocus, aperture and exposure control, distance information fed to the metering system, vibration reduction, zooming, and more.
see the range over which the image will be sharper then the conventional CoC value would give, or you can chose a larger number if you're prepared to live with a little less sharpness. There are also buttons for displaying the distance information in ...
for example by reading the position of the focusing shaft directly or by indirectly calculating the distance from the number of turns of the AF drive and information on how one turn translates into change of distance. The distance information can ...
This system also eliminates or under weights areas with large difference recognizing them as an extremely reflective object in the background or as a highly reflective subject, smartly ensuring it by considering the distance information data ...
 See also: Camera, Flash, Lenses, Sensor, Meter
  
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