الآلة ذات المقاس الكبير .. طريقة عمل آلة التصوير .. كتاب التصوير الضوئي

The large format camera .. How the camera works .. The book of photography

The large format camera

The large format camera is primarily intended for professional photography, knowing that the dimensions of the large camera require a large film size and the use of a support. Its single track makes its adaptation flexible. For this reason, the front and rear bodies can be moved and swung in all directions, allowing the shape of the image examined on the lens glass to be modified. As for the calibration, it is done by means of a bellows.

There are many types of lenses with different focal lengths: Each lens is mounted on a lens carrier plate containing the central closing device and the pupil. To see the image in the calibration glass, the shutter and the pupil are fully opened. Once calibrated and framed, all the movements of the machine can be fixed. To take the view, the shutter is closed, the lens is fed and calibrated, and the body is placed on the calibration glass. The bodies are double and therefore contain two film surfaces, each surface protected from light by a movable shutter. This shutter is raised when the frame is in place behind the machine and is returned to its original position after the picture is taken and before the frame is raised. This chamber is used with reel films or films with instant development thanks to special transfers.

The collimator and the image

The frosted glass (calibration glass) in the machine shows an inverted image, i.e. the head is down exactly as it is recorded on the film. The film cut to the appropriate size enters the back of the machine through the frame.