| 41. | Deep sky observations are carried out with this telescope using a variety of focal plane instruments.
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| 42. | The analysis by Nijboer and Zernike describes the intensity distribution close to the optimum focal plane.
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| 43. | The modularity of the focal plane allowed it to be broken into many different frequency configurations.
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| 44. | The lamp emits a focal plane beam of light as two white flashes every 20 seconds.
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| 45. | First came the electronically controlled focal plane shutter.
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| 46. | The focal plane was and the range was.
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| 47. | The scanning of the illumination point in the focal plane was achieved by moving the stage.
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| 48. | Setting the focal plane shutter speed required selecting both a slit width and a spring tension.
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| 49. | The focal plane of the light is.
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| 50. | It has a focal plane of.
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