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I know my D40 doesn't have a motor in it to auto-focus lenses.

What type of lens has the motor in it? How can I know which lenses will and will not work?

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3 Answers 3

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  • Nikon with AF-I and AF-S

  • Sigma with HSM (and older ones that list as "with motor for Nikon" or the like obviously)

  • Tamron with USD (and older ones that list as "with motor for Nikon" or the like obviously)

  • Tokina lenses specifically listing "built-in AF motor drive" as a feature

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As you note, the D40 doesn't have an autofocus motor. Nikon's designation for the lenses that have the motor include the AF-I and AF-S lines.

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Nikon Lenses with the designation AI, AI-S, AF will not work on your camera. Lens zCodes can be found here:

http://www.dslrgeeks.com/forum/showthread.php?t=4

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