Complex sentence: The common practice of defining resolution in terms of pixel count is not meaningful, as it is the overall OTF of the complete system, including lens and anti-aliasing filter as well as other factors, that defines true performance.
Split into simpler sentences: The common practice of defining resolution performance in terms of pixel count is not meaningful. Instead, it is the overall OTF of the complete system, including lens and anti-aliasing filter as well as other factors, that defines true performance.