| 11. | The first portrait objective lenses were rather small and had a diameter of 2.6 cm.
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| 12. | Reflected in the mirror is the image from the second objective lens ( C ).
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| 13. | Where is the width of the pixel and is the f-number of the objective lens.
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| 14. | An oil immersion objective is an objective lens specially designed to be used in this way.
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| 15. | A high power objective lens is typically used.
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| 16. | German optics companies ( T�pfer, Voigtl�nderkorrigie, Zeiss ) produced the Petzval objective lens until the 1940s.
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| 17. | These and other considerations are major factors influencing the choice of magnification and objective lens diameter.
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| 18. | An "'oil immersion objective "'is an objective lens specially designed to be used in this way.
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| 19. | In 1873 they built the objective lens for the refractor at the United States Naval Observatory.
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| 20. | The measurement arm 140 contains an objective lens 141 for imaging the surface to be studied 152.
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