Old Vintage Cameras: Bell and Howell Dual 8 Projector, Heathkit Vacuum Tube Tester

Thursday, December 8, 2011

Bell and Howell Dual 8 Projector, Heathkit Vacuum Tube Tester

Bell and Howell Super 8 Projector
$78.45 Price:
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Heathkit Dynamic Tube Checker 1950
$248.45 Price:
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Vivitar Zoom Lens 62mm 100 - 300mm
$53.45 Price:
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Argus 35mm Lens
$48.45 Price:
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Accura Viewer Attachment
$27.45 Price:
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Continental
Leather
Camera Bag
$68.45 Price:
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Votar Camera Wrist Strap
$9.45 Price:
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Time-O-Lite Manual
$9.45 Price:
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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.