fixed slit造句

In film photography, a camera with a vertical slit aperture can either have fixed film and a moving slit, or a fixed slit and moving film.
Many variations are possible : collimation can be done with concave mirrors, dispersion can be achieved with glass prisms, and scanning can be achieved with fixed slits and spinning square prisms.
The Widelux produced a 140?wide image in a 24?9 mm frame on 135 film with a Lux 26mm f / 2.8 lens and controlled shutter speed by varying rotation speed on a fixed slit width.
It's difficult to find fixed slit in a sentence. 用fixed slit造句挺难的