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What does HSM / USM mean?

What do the Numbers and Letters on Lenses Mean?

What do the Numbers and Letters on Lenses Mean?

There are lots of numbers and letters on lenses, but what do they mean? It’s actually not that difficult to understand, so allow me to break it down for you. This was another requested post from Barbara who’s on my video training course. When you’re on the course, you can

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