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... Possible source of poster-sized printouts: https://blueprintsprinting.com/pricing/ Gold on microscope slide: https://sci-hub.tw/10.1109/MEMSYS.201... Commerical microelectrode arrays: https://www.multichannelsystems.com/p... Vacuum film holder: https://web.archive.org/web/201110161... Test patterns: http://www.bealecorner.org/red/test-p... Thought emporium:    / thechemlife   Huygens Optics:    / huygensoptics   Sam Zeloof:    / szeloof   Support Applied Science on Patreon:   / appliedscience