see http://people.smu.edu/rmonagha/mf/pinhole.html#zap
uses electric spark to "zap" a pinhole circa 20 microns in size etc.
nicad battery, needle etc. using Mike Sinclair's nifty tips and techniques

hth bobm

* Robert Monaghan POB752182 Southern Methodist University, Dallas Tx 75275  *
* Third Party 35mm Lenses: http://people.smu.edu/rmonagha/third/index.html  *
* Medium Format Cameras: http://people.smu.edu/rmonagha/mf/index.html       *


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