Nikon D800 User Manual (en)

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Non-CPU Lenses
By specifying lens data (lens focal length and maximum aperture), 
the user can gain access to a variety of CPU lens functions when 
using a non-CPU lens.
If the focal length of the lens is known:
• Power zoom can be used with optional flash units (
• Lens focal length is listed (with an asterisk) in the playback photo 
info display
If the maximum aperture of the lens is known:
• The aperture value is displayed in the control panel and 
viewfinder
• Flash level is adjusted for changes in aperture
• Aperture is listed (with an asterisk) in the playback photo info 
display
Specifying both the focal length and maximum aperture of the lens:
• Enables color matrix metering (note that it may be necessary to 
use center-weighted or spot metering to achieve accurate results 
with some lenses, including Reflex-NIKKOR lenses)
• Improves the precision of center-weighted and spot metering 
and i-TTL balanced fill-flash for digital SLR
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Focal Length Not Listed
If the correct focal length is not listed, choose the closest value greater 
than the actual focal length of the lens.
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Teleconverters and Zoom Lenses
The maximum aperture for teleconverters is the combined maximum 
aperture of the teleconverter and the lens. Note that lens data are not 
adjusted when non-CPU lenses are zoomed in or out. The data for 
different focal lengths can be entered as separate lens numbers, or the 
data for the lens can be edited to reflect the new values for lens focal 
length and maximum aperture each time zoom is adjusted.