What is the SLR camera lens motor?
The autofocus camera requires a motor-driven lens focus assembly when focusing. All Canon autofocus lenses focus on the drive motors are in the lens. Nikon lens where the lens models have AF-S words of the lens of the drive motor are in the lens, only the AF word lens must be driven by the camera body motor focus, Nikon's existing digital SLR, D40 D40X D60 D3000 D5000 are no body motor, the use of AF-S lens can automatically focus, the use of AF lens can only focus manually but can automatically expose. Other Nikon digital SLRs have body motors that can use all Nikon AF-S and AF lens autofocuss.
Generally installed in the camera motor has several roles, the film over the film, drive the focus, drive zoom.
And now the digital age over the chip has long been useless, so there is no, the focus motor installed in the fuselage and the lens of the two drive, electric zoom only in some individual brands of SLR models appeared, now Has no one used
As for the Nikon machines that eunuchs do not need to be too much emphasis on the problem, Nikon is the first to use the body-driven focus mode, and the old lens is not built-in drive motor, the use of the fuselage motor drive, I think you buy this machine Too likely to buy the old lens why do he have no body motor? And the best digital camera to buy a new type of lens, the old lens can not be considered temporarily, then do not affect the use of Do not worry
The current entry-level machine only Nikon produced a part of the eunuch machine, that is, no fuselage motor, in the absence of the focus of the motor lens will not be used on the auto focus.
To put it easier, the fuselage that motor is the power to turn the lens focus, without it, you can not automatically focus. Only use the lens built-in ultrasonic motor lens to auto focus. Such as D5000 machines such as the use of Nikon lens, can only use the AF-S lens, not that S on behalf of this is a need to drive the body of the camera, the D5000 can not achieve AF function!
