Zeiss Ikon Volta with Rol-Bak Film Back Rare c. 1920s

Rare Zeiss Ikon Volta 135/7 with a Rol-Bak Film Back

The Volta is a folding bed (folding plate) camera for 9 x 12 cm film plates or sheet film. The focus is by the single extension bellows by sliding the front on the rail.The shutter is a Derval Shutter with speeds 1/15, 1/50, and 1/100 sec. plus T and B mode, the lens is a Novar Anastigmat 1:6.3 f = 13.5 cm lens. It was originally introduced in 1920 and production continued by Zeiss Ikon until 1929.

This very rare, very vintage, very collectible camera has an even rarer Rol-Bak (film back) that reads: “Rol-Bak Wilmar Electronics Inc. NY, NY USA” with a little sticker that states: “Burke and James Solar Enlargers – Cameras – Photo Supplies Since 1897 Chicago USA” . This used Zeiss Ikon Volta Camera and Rol-Bak Film-Back are both in very good vintage condition and sold as is. All knobs, levers, dials, buttons move freely and shutter clicks, no further testing was performed. 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.