| 41. | The Industar-10, Elmar & Tessar had completely different focal lengths.
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| 42. | Amateur astronomers tend to refer to telescope eyepieces by their focal length in millimetres.
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| 43. | It has an focal length, and a secondary mirror.
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| 44. | The corrective reciprocal of its focal length in meters.
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| 45. | To restrict that practice on the basis of focal length sounds like a bad joke.
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| 46. | It has a 35mm equivalent focal length of 15mm-26mm.
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| 47. | The focal length of the camera is also set.
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| 48. | Of course the focal length of the lens changes.
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| 49. | For sheet metal cutting, the focal length is usually.
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| 50. | So the eye's focal length becomes electronically controllable.
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