The difference between zoom and fixed focus

Fixed focal length: the focal length is fixed and can be divided into two types: aperture and non-aperture. ? Zoom: you can adjust the focal length as needed to enlarge or reduce the image of the subject.

1, with aperture: the aperture of the lens can be adjusted. According to the change of ambient light, the aperture should be adjusted accordingly. The aperture can be adjusted manually or automatically. Manual adjustment of aperture is called manual aperture; If the lens comes with a micro-motor to automatically adjust the aperture, it is called automatic aperture. No aperture: that is, fixed aperture, and its luminous flux is fixed. It is mainly used when the light source is constant or the camera has its own electronic shutter. ?

2. The zoom lenses commonly used for zooming include six-fold zoom and ten-fold zoom. Three variable lenses: adjustable focal length, adjustable focal length and adjustable aperture. Two variable lenses: adjustable focal length, adjustable focal length and automatic aperture.