Nikon D3000 - Manual (Page 179)

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AF-Assist Illumination
AF-assist illumination is not available with the following lenses:
• AF-S NIKKOR 14–24mm f/2.8G ED
• AF-S VR 70–200mm f/2.8G ED
• AF-S NIKKOR 70–200mm f/2.8G ED VR II
• AF-S 80–200mm f/2.8D ED
• AF-S VR 200mm f/2G ED
• AF-S VR 200–400mm f/4G ED
At ranges under 1 m (3 ft. 3 in.), the following lenses may block the AF-assist illuminator and
interfere with autofocus when lighting is poor:
• AF-S 17–35mm f/2.8D ED
• AF-S DX 17–55mm f/2.8G ED
• AF-S DX NIKKOR 18–105mm f/3.5–5.6G ED VR
• AF-S DX VR 18–200mm f/3.5–5.6G ED
• AF-S DX NIKKOR 18–200mm f/3.5–5.6G ED VR II
• AF-S NIKKOR 24–70mm f/2.8G ED
• AF-S VR 24–120mm f/3.5–5.6G ED
• AF-S 28–70mm f/2.8D ED
• AF-S VR Micro 105mm f/2.8G ED
A
Calculating Picture Angle
The size of the area exposed by a 35mm camera is 36 × 24 mm. The size of the area exposed
by the D3000, in contrast, is 23.6 × 15.8 mm, meaning that the picture angle of a 35mm
camera is approximately 1.5 times that of the D3000. The approximate focal length of lenses
for the D3000 in 35mm format can be calculated by multiplying the focal length of the lens
by about 1.5.
Picture size (35mm format)
Lens
(36 × 24 mm)
Picture diagonal
Picture size (D3000)
(23.6 × 15.8 mm)
Picture angle (35mm format)
Picture angle (D3000)