How does memory card speed affect taking photos?
Asked 4/12/2014
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I see memory cards labeled with speeds like 45MB/s or 80MB/s. Does card speed affect shooting, especially continuous/burst shooting? I think a faster card might let me take photos more rapidly. Is that correct, and are there other ways card speed matters?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
12y ago
2 Answers
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Most cameras have an internal buffer they write the pictures to first. From there, the images are written out to the (much slower) memory card. So, if you take pictures at maximum speed, your buffer will be full after some time (My Canon EOS 60D can make about 50 JPEGs or 12 RAW images until the buffer is full).
After that, I have to wait until at least some images have been written out to the memory card. And that process will be faster if the write speed of the card is faster.
Also note that some cameras cannot take advantage of the highest speeds of the cards. My 60D e.g. cannot use the highest speeds, so I stick to class 10 cards (meaning 10MB/s write speed)
So, continuous shooting is not possible, and the breaks between the bursts will be shorter the faster your card (and camera) is.
Originally by user20069. Source · Licensed CC BY-SA 4.0
user20069
12y ago
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Generated from our catalog & community — verify before relying on it.
Yes, but mostly after the camera’s buffer starts to fill.
Cameras usually save photos to an internal buffer first, then write them to the memory card. A faster card generally does not increase the camera’s maximum burst rate by itself; that rate is mainly limited by the camera’s mechanics, electronics, and processing.
Where card speed does matter is how quickly the buffer clears. A faster write speed lets images be saved to the card sooner, so you can shoot long bursts for longer or resume shooting sooner after the buffer fills.
It’s also important to distinguish read speed from write speed:
- read speed: affects how fast files copy to a computer, and sometimes image review
- write speed: affects how fast the camera can save buffered images during shooting
So for taking photos, write speed is the key spec. Even then, your camera must support that speed; some cameras cannot fully use the fastest cards, so buying an ultra-fast card may not give any benefit in-camera.
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