“What's the difference between UHS I and UHS II SD cards? I've recently purchased a Canon 80D so am switching from CF cards to SD cards, I want a fast writing card without spending a fortune.”
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The cards physically have more pins/contacts thus allowing a faster read/write rate but your device must support the additional pins. The higher end Nikon DSLRs with SD slots such as the D500 support UHS-II. Check your device manual for UHS-II support or check the device website.
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