This is a photo of the Korona Home Portrait
I made a lens board and adapted it to add a homemade pinhole turret.
This allows me to adjust the focal length like a zoom lens and still
have the appropriate pinhole aperture. It uses 8x10 film holders.
The pinhole aperture
is visible in the lens board and I can tape colored gel filters
on the back of the lens board as required. No ground glass
is used because the image is so dim. I sight from corner
to pinhole to get and idea of what is in the image field.
This is a detail
of the pinhole turret.
The turret allows me to adjust the focal length like a zoom
lens and still have the appropriate pinhole aperture.
The black arm is my shutter and the chart is a matrix of effective
F-stops for exposure calculations.