If you want to curb the invasiveness of flash photography, use infrared film and infrared flashbulbs. "The Lurking Park Voyeurs of 1970s Tokyo" (moderately NWS

If you want to curb the invasiveness of flash photography, use infrared film and infrared flashbulbs. "The Lurking Park Voyeurs of 1970s Tokyo" (moderately NWS) - http://www.slate.com/blogs/behold/2013/04/02/kohei_yoskiyuki_park_uses_infrared_flash_to_document_voyeurs_watching_couples.html http://www.slate.com/blogs/behold/2013/04/02/kohei_yoskiyuki... Oddly, this is something that we have lost in modern times, because xenon (electronic) strobes don't throw enough infrared to be worthwhile, and most of the infrared film stocks were actually originally designed for the military to use for spotting tanks and other camoflauged installations. You can still put an IR-pass filter over a xenon strobe and shoot with an IR-modified camera but it is not as easy nor as effective as purpose-built film+lighting.