| 1. | Long focal length versions exceed, which is enough to unbalance small telescopes.
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| 2. | The amount of magnification depends on the focal length of the eyepiece.
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| 3. | The lenses on the camera were a 200 mm focal length, film.
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| 4. | The EF series has encompassed focal lengths from 8 to 1200 mm.
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| 5. | Examples are 10 mm minimum focal length zoom lenses from several manufacturers.
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| 6. | This expresses the lens diameter as a fraction of its focal length.
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| 7. | Criteria relating CoC to the lens focal length have also been used.
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| 8. | Over the range of focal lengths, the minimum and maximum aperture vary.
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| 9. | As the focal length increases, the emphasis on the outstretched hand decreases.
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| 10. | The close knob is focal length and the far knob is focus.
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