Opinion: Bring on the 70-200mm equivalents

One swallow does not a summer make, said Aristotle, suggesting the dangers of looking for trends based on single examples. Even with this in mind, I'm pleased to see two manufacturers introduce 70-200mm equivalent zooms for APS-C cameras at this year's Photokina. First Fujifilm introduced its 50-140mm F2.8 R, and then Samsung followed suit with its 50-150mm F2.8 S. I think these lenses make more sense than actual 70-200mms; let me explain why...