Antique 4x5 camera creates 20 micron photolithography masks: Super tiny tax form

I use an antique 4x5 view camera to create high resolution photomasks in my home shop. Source of film and developing chemicals: https://www.freestylephoto.biz/531345-Arista-Ortho-Litho-Film-3.0-3.9x4.9-50-Sheets-For-4x5-Film-Holders Possible source of poster-sized printouts: https://blueprintsprinting.com/pricing/ Gold on microscope slide: https://sci-hub.tw/10.1109/MEMSYS.2013.6474404 Commerical microelectrode arrays: https://www.multichannelsystems.com/products/microelectrode-arrays Vacuum film holder: https://web.archive.org/web/20111016132122/http://cloudynights.com/documents/large.pdf Test patterns: http://www.bealecorner.org/red/test-patterns/ Thought emporium: https://www.youtube.com/user/TheChemlife Huygens Optics: https://www.youtube.com/user/huygensoptics Sam Zeloof: https://www.youtube.com/user/szeloof Support Applied Science on Patreon: https://www.patreon.com/AppliedScience