
When talking about Secure Digital or "SD" cards there are a few different things to consider. The first, and most obvious thing to consider is space. SD cards come in a multitude of sizes, from the simple 2GB card up to the over sized 64 GB card.
When choosing a card think of what kinds of things it will be used for. If the card is going to be used in a DSLR, a larger card is going to be beneficial. Having more memory obviously means being able to shoot more pictures at higher qualities.
Now that is not the only thing to think about. SD cards also come in different speeds. Speed is our friend. We all want to go fast. A faster card could make all the difference in the world. While most DSLR's can hold four or more pictures before having to buffer, it is always nicer not to have to wait.
When looking at a memory card, there is a number in small type on the front. This number represents the "class" of the card. A card class 2 will have the slowest read/write speeds, while a class 10 will have some of the fastest. For a complete rundown on card speeds I recommend visiting the SD card associations website.
And the simple part. Price. Find what you need, then find a price you are willing to pay. With a bit of thrift a very nice card can be found on the cheap.
For most pictures, a Class 4 or lower will suffice, for high speed photography, where several pictures will be generated very quickly in succession, Class 6 or preferably 10 is the speed you need.
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