Still look for the read and write speeds. Off brands will say U3, but they are nowhere close. There are many comparison charts online. I have found the real Transcend brand cards to be the best value, but SanDisk pro or Lexar pro are more than capable.You want something U3 rated, Walmart, Best Buy. Pretty much anywhere
Ty,
I was in error, the "V" speed class I guess is a relatively new rating system. v30 is just fine for 4k. I'm adding a link for SD card class ratings for all to make use of.
Speed Class - SD Association
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