Antique 4x5 camera creates 20 micron photolithography masks

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