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38 lines
1.8 KiB
38 lines
1.8 KiB
Appendix G
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Sample passage used to test listening comprehension
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The lens buyer must approach the problem of purchasing a lens of large aperture
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with caution. The first question to consider is whether the work one intends doing
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will actually require the extreme speed afforded by such a lens. Despite the glow-
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ing advertising claims, no extremely rapid lens is capable of giving, even when
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stopped down to its best aperture, the sharpness of definition which may be ob-
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tained with a well-corrected (and much lower-priced) lens of smaller maximum
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aperture. It is very doubtful if there exists a lens with maximum aperture in excess
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of F 4.5 which will give really sharp definition, whether wide open or at any
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smaller opening; the deficiencies of the large-apertured lens, if it is a fairly good
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one, will not be noticed in small contact prints; but in pictures enlarged to any con-
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siderable extent, they will be evident (or examination of the print with the low
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magnification of a reading glass will make them evident). With modermn, ex-
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tremely rapid films and with synchronized flash available for the amateur who can
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afford to go in for the type of photography that requires this kind of equipment, the
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occasions are indeed rare when a lens faster than F 4.5 is really needed.
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G.1 Test questions for the comprehension passage
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1. The main thought of this passage is that
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1. good photographic work requires the use of a fast lens
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2. lenses of small aperture provide less sharpness than lenses of
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large aperture
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3.lenses of small aperture are to be preferred for most
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photographic work
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4. modern photographic equipment requires the use of lenses of
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large aperture
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2. We may infer that some advertisements for photographic lenses tend
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to recommend the purchase of
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1. large-aperture lenses
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2. small-aperture lenses
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3. the most appropriate lenses
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4.F 4.5 lenses
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