Camera Explorations http://phototricks.posterous.com pinhole camera independent project posterous.com Mon, 17 May 2010 18:08:38 -0700 weekend http://phototricks.posterous.com/weekend-2204 http://phototricks.posterous.com/weekend-2204 This weekend I worked on two things: building a new camera and a bit of research.

My dad helped me with the camera- we cut a butter tub in half. With the curved film plane, it will hopefully create a cylindrical view on the picture. My dad helped me create a plan for an interchangeable pinhole. He also helped me paint the entire thing black to keep it lightproof. I also researched on special effects of pinhole camera: what I want to try is a curved film plane (see above camera), a "ghost" image, and also a multiple image (created by poking several holes in the camera). One more thing I looked at is what effect the pinhole and the length of the camera have on exposure time, image clarity, and depth of field. What happens is correlated to the f/number of a camera. This is calculated by the length of the camera divided by the diameter of the pinhole. The first camera I built (Altoid box) has a length of 48mm and diameter of .29mm This creates a f/number of 166 My next camera has measurements of 143mm and .5mm with an f/number of 286 The one I made this weekend is 83mm and .38mm making it f218.

PINHOLE SIZE:
exposure:as the hole decreases in size, less light gets in, therefore, exposure time needs to be longer
depth of field: increases with f/number (smaller hole gives a larger f/number and larger depth of field)
image sharpness: with larger holes, the depth is smaller, so it only focus on nearby objects. high f/numbers also can have diffraction and low f/numbers can have possible blurring

LENGTH OF CAMERA:
exposure: as the f/number increases, time needs to be longer, so as the length increases, exposure time does as well
depth of field: increases with f/number (larger camera length)
image sharpness: see above (larger length give larger f/numbers)

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