Nikon 1553 Manuale Utente

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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.