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The Lowdown on Plate Sizes


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Howw Does the 4-up reduction back work?

How Does the 4-up Reduction Back Work?

The process begins at position 1. The plate holder is loaded into the camera back, the sitter is composed, and the darkslide is removed to make the first exposure. Without removing the holder, the reduction back is shifted sideways into position 2 for the second exposure. Then it moves upward into position 3 for the third, and finally slides over to position 4 for the last exposure. Each quadrant of the plate captures its own moment, each frame distinct yet a part of the whole.Because the four exposures are made in quick succession, maintaining precise focus is essential. A head brace or focusing string ensures the sitter remains in focus, preserving clarity and continuity across every section of the plate.Once all exposures are made, the plate is treated exactly like a standard wet plate: developed, washed, and varnished in the usual sequence. The only difference is that four images now share the same plate, each retaining the depth, resolution, and tonal beauty of the wet plate process.

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5x7 plate

5x7 plate with 4 images


Images from 4-up plate as individual files
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