| 11. | The aperture was 29 mm with a focal length of 96 mm.
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| 12. | Wide-angle lenses have short focal lengths and make spatial distances more obvious.
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| 13. | The long focal lengths normally have to be combined with image stabilization.
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| 14. | Pinhole glasses do not actually refract the light or change focal length.
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| 15. | Depth of field depends on the focal length, aperture, and subject distance.
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| 16. | The seller of these lenses does not know the focal length.
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| 17. | It has a diameter primary mirror and a focal length of.
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| 18. | Consider a 35 mm camera with a lens having a focal length of.
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| 19. | Jean-Charles Houzeau invented in 1871 a heliometer with unequal focal lengths.
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| 20. | Camera lenses are made in a wide range of focal lengths.
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