Explanation of photographic terms 1, b gate: 2, color temperature 3, depth of field

1, door b: This is a long exposure mode and needs the support of the camera (or remote control). Press the shutter to start exposure, and then press the shutter to close.

2. Color temperature: Kelvin believes that if a pure black object can absorb all the heat falling on it without loss, and at the same time release all the energy generated by heat in the form of "light", then the wavelength of its maximum radiation intensity will change with the change of temperature. For example, when the thermal power of the blackbody is equivalent to 500-550℃, it will turn dark red (the radiation intensity of a certain red wavelength is the largest), and it will turn yellow when it reaches1050-150℃ ... Therefore, the color composition of the light source corresponds to the temperature of the blackbody. Color temperature is usually expressed in kelvin temperature (k), not in degrees-days.

3. Depth of field: the clear range before and after the focus.