3.3 Bellows
Description
This article is from the Gross
Specimen Photography, by Ed Uthman, MD
3.3 Bellows
This is not a lens at all but simply a shade that extends the lens very far away from the body of the camera. This allows you to take true photomacrographs, producing an image size up to three times that of the subject. For instance, when shooting a 105 mm lens on a bellows at full extension, the Lincoln Memorial on the reverse side of a U.S. penny fills a 35mm frame. Multiply this magnification by the amount you get when projecting a slide in a lecture hall and you get some idea of how Brobdingnagian a world you can present to an awed audience. The only problem with the bellows is that light intensity fall-off (as per the inverse square law) at maximum extension requires you increase the exposure accordingly. Also you have to be extremely careful about camera motion, which is magnified correspondingly.
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