Mon Jun 18, 2018 5:00 pm
Sorry to come to this late, but there have been a number of advancements in cards over the past few years beyond the old "Class 10" and MBps ratings. The ratings you should be looking for are the "V" ratings, which start at V6 and end at V90 (I'm not aware that they've come up with anything higher than that).
Class 2 through Class 10 are the original SD cards and were rated at 2, 4, 6, and 10MBps transfer speeds (transfer speeds are always theoretical, so in reality a Class 10 would transfer at about 6MBps). That was enough for SD or 720p video and 6 to 8MP digital cameras to take one photo a second. With 1080 video, a higher class was needed and so UHS-I/II/III were developed. UHS-II was never really adopted, so you had UHS-I, which was basically Class 10, and UHS-III, which was the equivalent of a Class 30 (30MBps transfer).
UHS-III (usually seen as U3 or a "U" with a 3 inside it) was enough for 24p or 30p 4K video, but not nearly enough of 4K 60p UHD, so the V-classes were developed, with V30 being the equivalent of U3, and V60 and V90 being capable of 60MBps and 90MBps, respectively. So, for a 18-26MP camera with 24-36MB RAW images, you're really going to need that 64GB V90 SDXC card that costs a lot more than those inexpensive Class-10 or U1/U3 cards.