Creating a small round hole in a piece of tin foil is harder than it sounds. When the pin is pushed through the tin foil it tends to tear it. However with some care and a steady hand a good enough pinhole can be made. By making a series of different size holes in a piece of tin foil and mounting them on card I could now set about testing the focus and light level on the image plain.
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| Various size pinholes |
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| Test looking out of window |
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| Image created from test |
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