Passage Summary: Camera makers brag about lens resolution, but those differences don't matter in the real world because the film itself is the bottleneck—it can't even show the extra detail the lenses provide.

Conclusion: Differences in lens resolution between modern cameras are irrelevant for the purposes of practical photography.

Reasoning: Modern lenses are so high-quality that they capture more detail than any photographic film is actually capable of displaying in a final image.

Analysis: I identified the conclusion by looking for the author's rebuttal to the manufacturers' claims. The first sentence introduces a common practice (advertising resolution), while the second sentence uses the transition 'however' to introduce the author's main point. The phrase 'since' then introduces the evidence, signaling that the preceding claim—that these differences are 'irrelevant'—is the primary conclusion. In 'Identify the Conclusion' tasks, always distinguish between the background context and the specific claim the author is trying to prove.