Old Black and White Photographs and
Stereo-view Cards

Vintage
Black and White Ph...

$6.00
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Vintage
Black and White Ph...

$6.00
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Stereoview
Card No 4 The M...

$6.00
USD

President
of Sears Stereov...

$6.00
USD

Vintage
1930's Photogr...

$9.00
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Vintage
Black and White Ph...

$6.00
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Vintage
Black and White Ph...

$6.00
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Vintage
Black and White Ph...

$6.00
USD

Vintage
Black and White Ph...

$6.00
USD

Vintage
Black and White Ph...

$8.00
USD

Vintage
Black and White Ph...

$6.00
USD

Vintage
Black and White Ph...

$6.00
USD

Vintage
Black and White Ph...

$6.00
USD

Vintage
Black and White Ph...

$6.00
USD

Vintage
Black and White Ph...

$6.00
USD

Vintage
Photograph of 2 Wo...

$3.00
USD

Vintage
Black and White Ph...

$6.00
USD

Vintage
Black and White Ph...

$6.00
USD

Vintage
Black and White Ph...

$6.00
USD

Vintage
Black and White Ph...

$6.00
USD

Vintage
Black and White Ph...

$6.00
USD

Tintype
Photo Circa 1800s ...

$12.00
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Tintype
Photo Circa 1800s ...

$12.00
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Tintype
Photo Circa 1800s ...

$10.00
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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.

Old Vintage Cameras

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Thursday, April 28, 2011