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Occasional Contributor
Posts: 20
Registered: ‎01-22-2017
Accepted Solution

SD cards and RAW

With my present bog standard cheap SD card the red light is on for about ten seconds if I shoot in RAW +jpg. I do not use burst mode but photographing birds in flight can mean an exposure every couple of seconds. Presumably write speed is the problem; which is a suitable quality to go for, the cards seem to be described in so many ways by different manufacturers.

Respected Contributor
Posts: 1,903
Registered: ‎02-17-2016

Re: SD cards and RAW

What camera?

Esteemed Contributor
Posts: 2,170
Registered: ‎11-14-2012

Re: SD cards and RAW

[ Edited ]

Yes, the camera model needs to be known too because they are a another variable. This site should help.

 

http://www.cameramemoryspeed.com/

"A skill is developed through constant practice with a passion to improve, not bought."
Occasional Contributor
Posts: 20
Registered: ‎01-22-2017

Re: SD cards and RAW

Thank you. My camera is a Canon 700D (T5) - 18 Mpixel. The nearest in the chart is the Rebel T6 - 24 Mpixel. With a lower file size it would seem that a lower speed card would be as fast to write to my camera as the expensive ones recommended for the T6. I have found a PNY Elite Performance SDHC Flash Memory Card 32GB Class 10 UHS-1 U3 at £15 post free which would seem to be a good compromise - am I correct?

Respected Contributor
Posts: 1,903
Registered: ‎02-17-2016

Re: SD cards and RAW

Have you re-formatted the card in the camera lately?

 

Does JPEG by itself take a long time?

 

Does RAW by itself take a long time?

Reputable Contributor
Posts: 629
Registered: ‎11-14-2012

Re: SD cards and RAW

[ Edited ]

mike21 wrote:

Thank you. My camera is a Canon 700D (T5) - 18 Mpixel. The nearest in the chart is the Rebel T6 - 24 Mpixel. With a lower file size it would seem that a lower speed card would be as fast to write to my camera as the expensive ones recommended for the T6. I have found a PNY Elite Performance SDHC Flash Memory Card 32GB Class 10 UHS-1 U3 at £15 post free which would seem to be a good compromise - am I correct?


700D has a maximum write speed of 44 MB/s. Your card, if it is the one with 95 MB/s* has a write speed of around 56 MB/s.

 

Anyway, have you low level format your card in camera?

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Occasional Contributor
Posts: 20
Registered: ‎01-22-2017

Re: SD cards and RAW

The card I am currently using is a Kingston HC - SD4/8GB. It has been formatted in the camera several times. I have not bought a new card yet, my problem is the long time it appears to take to write to the card when using RAW+JPG, based on the time the light is on. THe PNY I was considering has the words 100MB/Sec on the label, presumably the maximum read speed with USB 3.0  With a camera max write speed of 44MB/s writing a raw +jpg should be almost instantaneous with the PNY's write speed - presumably my present card write capability is very much below the 700D's maximum of 44 MB/sec. I am not bothered about read speed.

Honored Contributor
Posts: 5,216
Registered: ‎08-13-2015

Re: SD cards and RAW


mike21 wrote:

The card I am currently using is a Kingston HC - SD4/8GB. It has been formatted in the camera several times. I have not bought a new card yet, my problem is the long time it appears to take to write to the card when using RAW+JPG, based on the time the light is on. THe PNY I was considering has the words 100MB/Sec on the label, presumably the maximum read speed with USB 3.0  With a camera max write speed of 44MB/s writing a raw +jpg should be almost instantaneous with the PNY's write speed - presumably my present card write capability is very much below the 700D's maximum of 44 MB/sec. I am not bothered about read speed.


Use Lexar or Sandisk.  

 

Use full size SD cards, never micro-SD cards with adapters.

Be aware that a card that far exceeds what your camera needs can be just as bad as a card that falls short of the specifications.

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Occasional Contributor
Posts: 20
Registered: ‎01-22-2017

Re: SD cards and RAW

Thanks all. I now know enough to be able to find the appropriate new card.

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