The second hour of a stereo lab: moving a photograph two millimetres, turning a stereoscope one degree, and waiting for the moment somebody says, wait, I can see it.
@joealoh.bsky.social
@joealoh.bsky.socialThe second hour of a stereo lab: moving a photograph two millimetres, turning a stereoscope one degree, and waiting for the moment somebody says, wait, I can see it.
@joealoh.bsky.socialAlmost every stereo pair that will not fuse fails in one of five ways: lens spacing, the flight line, left and right swapped, the light, or looking outside the overlap.
@joealoh.bsky.socialGet this step wrong and hills become valleys.
@joealoh.bsky.socialThe mounted cards are the easy part. Somebody did that alignment decades ago.
@joealoh.bsky.socialOne of these photographs was taken in 1945. The other in 1958. Put a pair of lenses over them and they stop being flat.
@joealoh.bsky.socialMoss Point, Mississippi, photographed in January 1958. Ishigaki, Japan, in March 1945. Put a stereoscope over them and they still do exactly what they did the day they were taken.
@joealoh.bsky.socialTwo flat pieces of paper, and a city stands up off the table.