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Canon STM Vs. USM - What's The Difference? (And Which Is Best)
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STM vs USM Lenses
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Amazon.com : JJC Reversible Lens Hood Shade Protector EW-73D Replacement for Canon EF-S 18-135mm F3.5-5.6 is USM (Fits 18-135mm USM Only) & for Canon RF 24-105mm F4-7.1 is STM Lens : Electronics
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