I have been interested in military aerial wide-angle lenses since the Sixties when I worked on an RAF recon base, and managed to get several lenses. In my early years I began with this DIY strictly as a prototype to test a three-inch WA to see how well it performed. Made from plywood. Focus is done by sliding the lens in a track on the right side - very little movement is required. At this moment I am not sure where it is - so many trials go to storage.'
The shutter is an electrically controlled guillotine that I fudged by inserting a common cable release into the works.
It performed beyond expectation.
It is LF! 5x5"
I have more unconventional w/a LF I made should anyone wish to see them.
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