Old Vintage Cameras: Argus C Twenty

Sunday, June 5, 2011

Argus C Twenty

Argus C Twenty Vintage 35mm Film Camera 1956

The Argus C Twenty is a 35mm fixed-lens rangefinder made in the USA by Argus around 1956. It has a Bakelite body and is thinner and lighter than the Argus C3 camera (also known as the Brick). This camera has a double exposure prevention and a multiple-stroke film advance lever, the Lens is a 44mm f/3.5 coated Argus Cintar triplet, f/3.5 – f/22, focus down to 2.5ft, the Shutter is between-the-lens: 1/25, 1/50, 1/100, 1/200 + “B”, manually cocked, the viewfinders – Separate viewfinder and rangefinder windows. Retro-Vintage-Bazaar offers a wide selection of vintage cameras and as of this post have an Argus C Twenty available for purchase. HERE

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What is a Camera Obscura?

The camera obscura (Latin; camera = vaulted chamber | obscura = dark, thus darkened chamber or room) is an optical device that projects an image of its surroundings on a screen. It is used in drawing and for entertainment, and was one of the inventions that led to photography. The device consists of a box or room with a hole in one side. Light from an external scene passes through the hole and strikes a surface inside where it is reproduced, upside-down, but with color and perspective preserved. The image can be projected onto paper, and can then be traced to produce a highly accurate representation. Using mirrors, as in the 18th century overhead version (illustrated in the History section below), it is possible to project a right-side-up image. Another more portable type is a box with an angled mirror projecting onto tracing paper placed on the glass top, the image being upright as viewed from the back. As a pinhole is made smaller, the image gets sharper, but the projected image becomes dimmer. With too small a pinhole the sharpness again becomes worse due to diffraction. Some practical camera obscuras use a lens rather than a pinhole because it allows a larger aperture, giving a usable brightness while maintaining focus.