Excerpt from The Philadelphia Photographer, Vol. 4: January, 1867
Most photographers, in purchasing a cam era, satisfy themselves by a careful measure ment that the sensitive plate will occupy the same position as the focussing screen, Observe that the wood-work is neat and c... lose, and rest content with that.
Now there is no more important requisite in a camera, than that the sensitive plate should be exactly perpendicular to the Optic axis Of the lens, otherwise, while one Side of the plate is in true focus, the other will not be strictly so. To a cursory observation the whole may appear to be in tolerably good focus, but a careful examination with a glass will verify the difference.
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