Pin hole cameras are a light-proof box with a small hole in one side. Light from a scene passes through this single point and projects an inverted image on the opposite side of the box.
They are called pin hole cameras becasue the apeture is created with a pin, sounds simple does it not.
I built mine by painting the inside of a biscuit tin matte black, after leaving that to dry i drilled a hole in the side and smoothed of the rough edges, i set up some masking tape curls across from the pin hole so that the paper would have something to attach to and would not fall over during exposure,
i then made a lense out of a piece of tin foil that was taped to the outside of our hole and then made a cardboard shutter that was fixed with gaffer tape.
I them went into the dark room and loaded my camera with light sensitive photo paper, i then shut my camera
making sure it was light tight, then i was ready to go out and shot.
(the above picture is not of my pinhole camera it is an example found on google images)
Before i went out with my pin hole camera i had to measure my focul length (the distance from lense to photo paper) for my tin it was 260mm, which would help me work out my exposure times.
the equation for this was focul length/diameter of the pinhole which in my case is
260mm / 0.8mm = 325 which worked out to be an exposure time of 2 mins outside and 20 mins inside.
this exposure time did not quite work out it resulted in either under or over exposure. i would like to do this project again so that i might get some better photos.
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