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A Lens f-number
The f-number given in lens names is the maximum aperture of the lens.
A Compatible Non-CPU Lenses
When using non-CPU lenses and accessories, rotate the camera mode dial to A or M and set
aperture using the lens aperture ring.
In other modes, the shutter-release is disabled.
Non-
CPU lens data (0 149) can be used to enable many of the features available with CPU
lenses, including color matrix metering; if no data are provided, center-weighted metering
will be used in place of color matrix metering, while if the maximum aperture is not
provided, the camera aperture display will show the number of stops from maximum
aperture and the actual aperture value must be read off the lens aperture ring.
D Incompatible Accessories and Non-CPU Lenses
The following can NOT be used with the D7100:
• TC-16AS AF teleconverter
• Non-AI lenses
• Lenses that require the AU-1 focusing unit
(400mm f/4.5, 600mm f/5.6, 800mm f/8,
1200mm f/11)
• Fisheye (6mm f/5.6, 7.5mm f/5.6, 8mm f/8,
OP 10mm f/5.6)
• 2.1cm f/4
• Extension Ring K2
• 180–600mm f/8 ED (serial numbers
174041–174180)
• 360–1200mm f/11 ED (serial numbers
174031–174127)
• 200–600mm f/9.5 (serial numbers 280001–
300490)
• AF lenses for the F3AF (AF 80mm f/2.8, AF
200mm f/3.5 ED, AF Teleconverter TC-16)
• PC 28mm f/4 (serial number 180900 or
earlier)
• PC 35mm f/2.8 (serial numbers 851001–
906200)
• PC 35mm f/3.5 (old type)
• Reflex 1000mm f/6.3 (old type)
• Reflex 1000mm f/11 (serial numbers
142361–143000)
• Reflex 2000mm f/11 (serial numbers
200111–200310)