Pinhole Camera

A pinhole camera is a simple camera without a lens and with a single small aperture — effectively a light-proof box with a small hole in one side. Light from a scene passes through this single point and projects an inverted image on the opposite side of the box.

A pinhole camera works on a simple principle. Imagine you are inside a large, dark, room-sized box containing a pinhole.

Cameras and Parts of the Camera

1.      A single-lens reflex (SLR) camera is a camera that typically uses a semi-automatic moving mirror system that permits the photographer to see exactly what will be captured by the film or digital imaging system (after a very small delay), as opposed to pre-SLR cameras where the view through the viewfinder could be significantly different from what was captured on film.

2.        A twin-lens reflex camera (TLR) is a type of camera with two objective lenses of the same focal length.

3.       A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging the beam.

4.       A shutter is a device that allows light to pass for a determined period of time, for the purpose of exposing photographic film or a light-sensitive electronic sensor to light to capture a permanent image of a scene. A shutter can also be used to allow pulses of light to pass outwards, as in a movie projector or signal lamp.

5.      Shutter speed is a common term used to discuss exposure time, the effective length of time a camera's shutter is open. The total exposure is proportional to this exposure time, or duration of light reaching the film or image sensor.

6.       Aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane.

7.      Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system.  

8.      International Standards Organisation (ISO 5800:1977, revised 1987; international),  the American Standards Association (ASA PH2.5-1960, American).

9.      Shutter-release button (sometimes just shutter release or shutter button) is a button found on many cameras, used to take a picture.

10.  Usually rest around the pentaprism of the camera (but some were designed around the film rewind knob). It has an electrical contact which mated with a contact in the mounting foot of the flash unit.