question: Why should noise-based speed be rounded down to a lower standard ?
answer: exposure according to the lower saturation-based speed would not result in a visibly better image
turker_answer: Noise-based speed should be rounded down to a lower standard because exposure according to the lower saturation-based speed would not result in a visibly better image to a lower standard .
rule-based: Noise-based speed should be rounded down exposure according to the lower saturation-based speed would not result in a visibly better image to a lower standard .