On camera and shutter angle of camera

In a film camera, the film is exposed in the form of a pie-shaped mirror called a shutter.

Rotate the front film door. Rotate it like a mirror to reflect the image into the ground glass so that the part can see the image.

Other times, the mirror allows light to pass through the film.

In a simple camera, this shutter is fixed and usually semicircular.

In more advanced cameras, the shutter shape can be adjusted. This shutter setting refers to the shutter angle.