Logical Reasoning

PT110 · S2 · Q15 Camera manufacturers typically advertise their

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Camera manufacturers typically advertise their products by citing the resolution of their cameras' lenses, the resolution of a lens being the degree of detail the lens is capable of reproducing in the image it projects onto the film.

Conclusion

The different resolutions touted in camera advertisements are irrelevant for practical photography.

Evidence

Resolution is about how much detail the lens is capable of reproducing onto film, but all modern lenses are so good that they have resolution to spare (i.e. they can capture far more detail than any film is even capable of rendering).

Evaluate

There are two really big structural clues showing us where to find the conclusion.

Claim 1. Claim 2, however, since Claim 3.

"But / yet / however" tell us that we are leaving Background / Counterpoint territory and entering Author's Argument territory.

"For / after all / because / since" tell us that we're looking at a premise, and that the next-door idea is a Conclusion.

So Claim 2 is apparently our conclusion. It is the author's supported opinion?

Yes, she's saying these resolution differences are irrelevant. Why? Because the extra resolution any given camera would offer is useless. All modern lenses are so good that even the lowest resolution one is still capable of more than film can even use.

15.

Which one of the following most accurately states the main point of the argument?

  1. Camera manufacturers ought to concentrate

    Trap

    Never Mentioned What Else Might They Say This is a trap where they hope students will go for The Next Thing the author might say. But we're just trying to point back to something the author did say.

    2% picked this

  2. Apart from differences in resolution,

    Out of Scope

    Out of Scope: apart from resolution Opposite The author is saying "as far as resolution goes, there is no practical difference". She hasn't said anything about possibly important differences between other features of modern cameras.

    16% picked this

  3. Correct

    Advertised differences among cameras in

    Why this is right

    This is a meaning match for the 2nd claim, that "advertised differences [about resolution] are irrelevant for practical photograph".

    Skill tested: Main Conclusion · how this choice captures the argument's function is the move to repeat next time.

    72% picked this

  4. In concentrating their advertising on

    Never Mentioned

    The author's conclusion is just that "advertised resolution differences are actually meaningless to a customer on a practical level". She doesn't say The Next Thought ... "so these ad makers are dumb" / "so they should emphasize something else" / etc. Her argument is descriptive, not normative or prescriptive.

    2% picked this

  5. Differences among photographic films in

    Never Mentioned

    The author never talks about differences in film or how they might affect quality.

    7% picked this

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