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Kmccarthy
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Why do crop lenses usually start at 18mm?


I've always wondered why APS-C standard zoom lenses always seem to start at 18mm (29mm equiv), while full frame lenses start at 24mm. (The one notable exception was the old EF 15-85mm, which was a great all around lens.)

Is there some underlying technical reason for this, or just product strategy to drive people to full frame?

The R10 + RF-S 18-150mm would be the perfect light travel kit if if started at 15mm. The next best option is the R8 + RF 24-240mm, which is much heavier.



Aug 13, 2025 at 05:41 PM





  Previous versions of Kmccarthy's message #16869857 « Why do crop lenses usually start at 18mm? »