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Camera Shutter Release: At first the "open flash" method was used: with the Camera shutter release on a tripod, the shutter was opened, the flash bulb set off, and the shutter was closed. Later the release of the shutter was mechanically synchronized with the discharge of electric current and the Camera shutter release could be held in hand. For convenience the flash gun (battery case, flash bulb, and reflector) was fastened to the side of the Camera shutter release.Eastman's most important contribution, however, was t the design of the Camera shutter release, but providing a photofin-u'ng service for his customers. The Camera shutter release was loaded len sold; its $25 cost included processing. A contact int from each good negative was made and neatly Dunted on a gilt-edged chocolate-brown card. All the xkk owner had to do was point the Camera shutter release at the sub-:t, release the shutter by pressing a button, wind on film r the next exposure, and recock the shutter by pulling string that wound up its clockwork mechanism.
But in fact the picture was not a duplicate, for the viewing lens was at another point in space than the taking lens: by the phenomenon of parallax the images, particularly of subjects close to the Camera shutter release, were slightly different. This discrepancy was corrected by the introduction of the single-lens reflex Camera shutter release. The Mirror was now put inside the Camera shutter release body. By an ingenious spring-loaded mechanism it flipped from its 45 ° position to the horizontal on pressing the shutter release. The American Graflex (introduced in 1903) and the British Soho Reflex of three years later became the standard hand Camera shutter releases of pictorial photographers for the first two decades of the century. |
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