Difference between DSLR with motor and without motor

1, the body motor and lens motor have one function: to complete focusing

2, the operation procedure of the body motor is: the camera measures the target focal length according to the rangefinder system, and then transmits the driving force to the focusing mechanism in the mirror through the body motor, and drives the lens to complete focusing. Advantage: there is no drive motor in the lens, which can reduce cost. Disadvantages are: slow focusing speed, noise, ultra-long focal length lens is difficult to drive.

3, the lens motor operation program is: the camera according to the rangefinder system to measure the target focal length, the focusing data to the lens in the microprocessor system, the system gives the lens motor focusing instructions and data, the lens motor and then in accordance with the instructions and data to drive the lens to complete the focus. Advantage: fast focusing speed, low noise. Disadvantage: more expensive, resulting in higher lens costs and selling prices.

4, all of the autofocus lenses need to rely on the motor to complete the focus, usually is the way the above two motors. Regardless of the motor, it can be turned off so that the focus ring can be rotated manually to complete the focus. This is manual focusing.

5, the speed of autofocus is much higher than manual focus, for example, the lens motor to complete a focus time of only 0.1-0.2 seconds, and in such a short period of time, manual focus is impossible to complete. This still refers to the stationary target, encountered a moving target manual focus on the more troublesome, and autofocus can also take continuous tracking focus mode, always keep focus, which is even stronger than manual.

6, manual focus and autofocus refers to the camera's focus mode, while the automatic mode refers to the camera's exposure mode, are two different things. Manual or auto focus can be taken in any mode of the camera.