| 21. | Pinhole glasses do not actually refract the light or change focal length.
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| 22. | The crispest image is obtained using a pinhole size determined by the formula
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| 23. | The modern Diana F + offers four apertures, including a pinhole.
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| 24. | I made a pinhole camera and used photo paper as the negative.
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| 25. | He started to use a pinhole camera for creation of impressionistic photography.
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| 26. | Reptiles also have eyes the size of pinholes or protected by valves.
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| 27. | The development of the pinhole occluder goes back to 1940.
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| 28. | This allows gradual pressure equalization, like a pinhole would.
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| 29. | His main interest in photography is landscapes and pinhole photography.
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| 30. | How much are you actually seeing with the eye through pinhole here?
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