Invisible Light (Infrared Flash)

With inspiration from Weegee, I've made myself an invisible flash from a #87 Lee filter, a flash diffuser, and some cardboard and black tape. If you look right at it when it goes off you see a dim red blip, which isn't bright enough to even make you blink.

There's more information on making, testing, and using an 'invisible' infrared flash in the following sets:

• Making the filter
• Testing exposure
• Testing focus (coming)
• Results

These tests were done using Kodak high-speed infrared film, which Kodak has announced will be discontinued as of December 2007. I expect I'll repeat them with Rollei/Efke Infrared film, but it is neither as sensitive nor as fast as the Kodak film, so I don't expect comparable results.