| 31. | It seems to have an objective lens, although it is about a centimetre behind the front of the telescope.
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| 32. | Such designs are typically unable to be tilted without blocking the beam path or interfering with the objective lens.
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| 33. | Also, the difference in optical path length through each of the two objective lenses is carefully aligned to be minimal.
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| 34. | A thin wire ( filament ), placed at the focal plane of the objective lens, is heated by electric current.
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| 35. | Also the difference in optical path length through each of the two objective lenses is carefully aligned to be minimal.
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| 36. | He published many papers on the subject and designed stands, objective lenses and prisms, fabricating some of the latter himself.
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| 37. | The use of the magnetic field of the objective lens of the microscope has been incorporated in another commercial patent.
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| 38. | Even a pair of 7x35 binoculars will do, but the smaller 35-millimeter objective lens isn't as good for sky viewing.
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| 39. | This optical sight features 4?magnification, a 6?field of view, and the objective lens is 24 mm in diameter.
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| 40. | High magnification objective lenses typically have higher numerical apertures ( and so better optical sectioning ) than low magnification objectives.
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