Are You Using The Best Type Of Memory Card?
I’m sure you’ve seen SD, CF and SDHC mentioned before. Do you know what these letters actually mean? There is a great article on Craftsy about the most important things to consider when selecting a memory card for your DSLR.
Here are the specs you need to keep in mind when selecting a memory card.
First, you need to find out what kind of card your camera uses. The two important formats are Secure Digital (SD) and Compact Flash (CF). Most cameras use a version of SD cards, either plain old SD, SDHC or SDXC. SDHC stands for High Capacity—meaning between 2 and 32 Gigabytes. The SDXC allows an even higher capacity in the same size card—up to 2 Terabytes. Compact Flash cards are much bigger in physical size and, these days, are typically only used in higher-end cameras and video cameras.
Memory size on the card
Depending on the capacity of the card you could hold a few dozen images or a few thousand images. If I’m photographing something important, I prefer to use several smaller cards. On the outside chance one of the cards becomes corrupt, I won’t lose ALL of my images. 8GB cards hold about 300 images for my camera. Every 300 or so images I’ll change cards.
Cards are assigned a class based on their write speeds, either 2, 4, 6 or 10. Class 10 cards are able to write at least 10 MB/sec, while Class 6 cards can write at least 6 MB/sec. In addition to the class, memory cards will have a speed rating. This is the maximum write speed. Some are 30 MB/sec and some are 45 MB/sec, etc. The faster your card can write data, the more photos you can take in a row, and the higher definition of video you can continuously record.