Today it's Sd cards explained! I show you what all those little logos mean and how you can decide what SD memory card is best for you.

I use Lexar and Transcend SD cards and I make sure they have a minimum write speed of 30MB/second...Ten I know they will be fast enough for my A7iii and sony a7rii cameras when photographing sports or filming 4k video footage.


If you have a look on amazon, there are a whole host of different speeds, numbers and symbols on the cards... with the cards that are on offer...the slower they are, the cheaper they are, but you need to buy the right card for the device you'll be using it with.

For example, my gopro5 is fine with a C10/U1 card, but anything slower and it struggles, my A7iii has to have a U3/V30 card or higher to cope with 4k 100m

If you're not sure what the mimimum specs for your camera or device are, a quick search on line should answer that question.

For example, the A7iii shoots 4k at 100Mb/s so to get the MB/s you divide 100 by 8 as there are 8 bits in a byte. This gives you 12.5MB/s so to get constant video recording without any stoppages and any error messages when you insert the card, you need a U3/V30 card to cope with the data the camera will be outputting.

For photography you can use much slower cards, but it will take longer for the camera to write from the buffer to the card, if you have a UHS-ii card and you have it in the bottom slot, with a high minimum write speed, you'll get the fastest transfer of data to your sd card...and this is the biggest thing that will slow you down when photographing sports or using the continuous shutter on high and filling the buffer.

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Thanks

Mike

mike@boxheadmike.com

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