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Occasional Contributor
Posts: 24
Registered: ‎03-07-2016
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CF or SD in 5D III

I do understand the camera writes faster to a CF card but slower to SD card.

Granted the difference, I am interested to know how others make use of the two slots.

 

Would you use:

 

  • Only CF
  • Only SD
  • Writing both to CF and SD in RAW
  • Write to CF in RAW and SD in Jpeg

Note: I do not have the 5D IIII until I take delivery this weekend.

Edwin Ho - Perth, Western Australia
5D, 5D III, EF 24-70mm f/2.8L, EF 70-200mm f/2.8L IS II, EF 40mm f/2.8 STM, 580 EX II
Lightroom 6, Photoshop Elements 10
And others.
Respected Contributor
Posts: 1,967
Registered: ‎02-26-2015

Re: CF or SD in 5D III


@Eaglewing wrote:

I do understand the camera writes faster to a CF card but slower to SD card.

Granted the difference, I am interested to know how others make use of the two slots.

 

Would you use:

 

  • Only CF
  • Only SD
  • Writing both to CF and SD in RAW
  • Write to CF in RAW and SD in Jpeg

Note: I do not have the 5D IIII until I take delivery this weekend.


While I have a 7D Mk II and not a 5D Mk III, have a card in both slots, but, write only RAWs to the CF slot. I like the slightly larger CF card, and think they are a little more durable to handle. 

Honored Contributor
Posts: 5,827
Registered: ‎11-13-2012

Re: CF or SD in 5D III

If you write RAW to both cards the slower SD card will control the buffer clearing rate. Writing RAW to CF and JPEG to SD may or may not affect speed, depending on JPEG size. SD card write speed is controlled by camera; high speed SD card won't overcome this.

 

 

John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LRCC Classic
Honored Contributor
Posts: 5,012
Registered: ‎06-25-2014

Re: CF or SD in 5D III


@Eaglewing wrote:

I do understand the camera writes faster to a CF card but slower to SD card.

Granted the difference, I am interested to know how others make use of the two slots.

 

Would you use:

 

  • Only CF
  • Only SD
  • Writing both to CF and SD in RAW
  • Write to CF in RAW and SD in Jpeg

Note: I do not have the 5D IIII until I take delivery this weekend.


One thing to keep in mind that I don't think is well described in the manual: If you have cards in both slots and have set the preference to write to one card until it fills up and then switch to the other, taking the active card out (even, in most cases, with the camera turned off) will reset the preference to the other card. And putting the removed card back in the camera will NOT restore the preference to what it was; you have to reset it manually.

 

That hideous misfeature is evidently intentional, as it is retained in the 7D Mark II.

Bob
Philadelphia, Pennsylvania USA
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Posts: 8,346
Registered: ‎08-13-2015

Re: CF or SD in 5D III

"That hideous misfeature is evidently intentional, as it is retained in the 7D Mark II."  

 

I would agree with that behavior.  The camera would either have to assume that you replaced the same card into the slot, or it would have to go through some elaborate routine in order to determine if the original card has been returned, without modificaitons. 

 

Without the camera continuously making a backup copy of the card ahead of time, it should not have any way of performing the latter test and determination.  The camera is forced to assume that you have inserted a new and different card, and rely on you to tell it what to do.

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Honored Contributor
Posts: 5,012
Registered: ‎06-25-2014

Re: CF or SD in 5D III


@Waddizzle wrote:

"That hideous misfeature is evidently intentional, as it is retained in the 7D Mark II."  

 

I would agree with that behavior.  The camera would either have to assume that you replaced the same card into the slot, or it would have to go through some elaborate routine in order to determine if the original card has been returned, without modificaitons. 

 

Without the camera continuously making a backup copy of the card ahead of time, it should not have any way of performing the latter test and determination.  The camera is forced to assume that you have inserted a new and different card, and rely on you to tell it what to do.


I don't follow that reasoning at all. Nothing in the specs promises "a backup copy of the card". Indeed, in the case I cited, the cards are used consecutively, without any image file being written to both cards. So it doesn't make a particle of difference whether the same card or a different card is returned to the original slot.

Bob
Philadelphia, Pennsylvania USA
Occasional Contributor
Posts: 24
Registered: ‎03-07-2016

Re: CF or SD in 5D III

Gentlemen,

 

Thank you for your contribution and sharing your views, much appreciated.

Back to my original post, how do you use the two-slots system in the 5D III, granted it has its limitation.

Edwin Ho - Perth, Western Australia
5D, 5D III, EF 24-70mm f/2.8L, EF 70-200mm f/2.8L IS II, EF 40mm f/2.8 STM, 580 EX II
Lightroom 6, Photoshop Elements 10
And others.
New Contributor
Posts: 1
Registered: ‎03-09-2016

Re: CF or SD in 5D III

This matter was really serious, card writing speed matter a lot. Thank you for valuable information.

I love idioms and Canon
Honored Contributor
Posts: 5,827
Registered: ‎11-13-2012

Re: CF or SD in 5D III

I have a 1D Mark IV, which has the same card configuration. I write RAW to the CF card and small JPEG to the SD card. I use the JPEGs for quick posting to the site I share travel photos on.

John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LRCC Classic
Occasional Contributor
Posts: 24
Registered: ‎03-07-2016

Re: CF or SD in 5D III


@slang wrote:

This matter was really serious, card writing speed matter a lot. Thank you for valuable information.


Indeed, and that is why I am interested to learn how others get around it. I do expect to shoot some events with CF cards in RAW and yet having the safeguard of a backup in the SD slot. And if I choose to record RAW (perhaps smaller files) on the SD card, how much slower will it impact the overall speed of writing to both cards and this I can only trial it when I have the camera with me. I may consider shooting medium size files in Jpeg on SD as a backup.

 

I am not shooting fast pace sports events so perhaps I can live with slower writing speed.

 

Despite a slower writing speed on the SD slot, I view it as an added bonus to be able to have an instant back up in a shoot. But of course this is my personal opinion and others may feel differently about it and that is fine.

 

Also I see the 5D III as more than just a camera that that has two card slots. I was first drawn to the 5D III because of its superior ISO, AF and multi AF points.

Edwin Ho - Perth, Western Australia
5D, 5D III, EF 24-70mm f/2.8L, EF 70-200mm f/2.8L IS II, EF 40mm f/2.8 STM, 580 EX II
Lightroom 6, Photoshop Elements 10
And others.
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