Feel free to use this photograph for personal and commercial purposes.
Very interesting. I really like that reticle pattern.
A guy in the digital photo group I belong to has a vintage 50s-era Argus Seventy-five TLR camera that he has attached a digital camera to with a tin can in between to block out the light. He gets some great shots with it. He says there is a web site explaining how to do it. His name is Steven Dor on Facebook. Check him out.