| 21. | This is because view cameras have an adjustable focal plane
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| 22. | Both detector focal planes were designed specifically for this camera.
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| 23. | The active lighthouse has a focal plane of 28 metres ( 92 feet ).
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| 24. | The light displays two white flashes every 30 seconds at a focal plane of.
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| 25. | Using a sufficiently small aperture in the focal plane will make the lens telecentric.
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| 26. | The distance from the mirror to the focal plane is called the focal length.
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| 27. | The focal plane height was and the visibility range was.
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| 28. | The operational lighthouse has a focal plane of 18 metres ( 60 feet ).
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| 29. | It is fitted with a lantern and gallery with a focal plane height of.
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| 30. | The lens has a focal plane of with white light flashing every 12 seconds.
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