Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Guest
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 12 Jul 2011 (Tuesday) 17:37
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

MB/s for 8 fps?

 
Wuble
Hatchling
1 post
Joined Jul 2011
     
Jul 12, 2011 17:37 |  #1

I'm looking Into memory cards for the canon eos 7d i'm going to get. How many MB/s does the continuous 8 fps use up?:confused:




  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)
h14nha
Goldmember
Avatar
2,090 posts
Gallery: 11 photos
Likes: 179
Joined Nov 2008
Location: South Wales, UK
     
Jul 12, 2011 17:48 |  #2

I use a Sandisk 8 Gig, 30mb/s in my 7d.
EDIT
Welcome to POTN :)


Ian
There's no fool like an old skool fool :D
myflickr (external link)
My Gear - 7d, / 16-35mm F4 / 70-200 2.8 II / 100-400 / 300mm 2.8 / 500/4 :D XT-1 Graphite 18/35/56

  
  LOG IN TO REPLY
tkbslc
Cream of the Crop
24,586 posts
Likes: 26
Joined Nov 2008
Location: Utah, USA
     
Jul 12, 2011 17:53 |  #3

All shots go into internal memory buffer of the 7D, so you can shoot 8fps on any speed card. The difference is how fast the buffer can clear out to the card so you can shoot again.


Taylor
Galleries: Flickr (external link)
EOS Rp | iPhone 11 Pro Max

  
  LOG IN TO REPLY
Snydremark
my very own Lightrules moment
19,169 posts
Gallery: 58 photos
Likes: 3846
Joined Mar 2009
Location: Issaquah, WA USA
     
Jul 12, 2011 18:12 |  #4

tkbslc wrote in post #12747744 (external link)
All shots go into internal memory buffer of the 7D, so you can shoot 8fps on any speed card. The difference is how fast the buffer can clear out to the card so you can shoot again.

Short and sweet; that's the ticket right there.

Also, the image format you shoot in will affect how many shots, in sequence, you can shoot before running into that internal buffer limit. RAW will allow fewer shots before slowing down than medium quality JPEG.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

  
  LOG IN TO REPLY
amfoto1
Cream of the Crop
10,256 posts
Likes: 86
Joined Aug 2007
Location: San Jose, California
     
Jul 12, 2011 18:45 |  #5

Welcome to POTN,

I use 45MB/s, 60MB/s, 300X and 400X memory cards in my 7Ds (Sandisk and Lexar). All of them are UDMA. I don't notice any difference between these (but haven't done any scientifically controlled and measured testing either). So I think 45MB/s or 300X is fine. As suggested above, the card speed can effect how fast the buffer will clear and the camera ready to shoot again, but won't effect frame rate up to the limit of the buffer.

According to Canon, shooting Large/Fine JPEGs 7D will buffer about 94 images with non-UDMA compact flash and about 124 with UDMA compact flash, before the buffer fills. With RAW you get about 15 images with either type of memory. With RAW + JPEG it drops to about 6 images with either type of memory. Judging from this, it appears more important whether the card is UDMA or not, than the speed above 300X or 45MB/s.

7D frame rate slows down to allow for metering, focus and possibly some other functions.

I don't shoot video with my cameras... Just stills. Someone shooting video might find different memory requirements.

Card speed also effects downloads. Depends upon your reader... AFAIK, some are capable of as much as 54MB/s. Generally speaking I think those would need to be Firewire 800, built-in (SATA) or Express Card type readers. I use a built-in in my desktop and Express Card in my laptop that support up to this speed. (My download speeds bog down a bit across my network, though.)

Watch out for cards that advertise fast read speeds but have slow write speeds. I was considering some made by Dane-Elec (selling under another brand name) that looked like a great price and, if I recall correctly, advertised 300X or 400X, UDMA... But their true write speed in testing was below 100X!

Sandisk and Lexar are pretty reliable. Some folks have reported good results with Transcend. I've used some Sony in the past (slower types) that were fine.


Alan Myers (external link) "Walk softly and carry a big lens."
5DII, 7DII(x2), 7D(x2) & other cameras. 10-22mm, Tokina 12-24/4, 20/2.8, TS 24/3.5L, 24-70/2.8L, 28/1.8, 28-135 IS (x2), TS 45/2.8, 50/1.4, Tamron 60/2.0, 70-200/4L IS, 70-200/2.8 IS, 85/1.8, Tamron 90/2.5 Macro, 100/2.8 USM, 100-400L II, 135/2L, 180/3.5L, 300/4L IS (x2), 300/2.8L IS, 500/4L IS, EF 1.4X II, EF 2X II. Flashes, studio strobes & various access. - FLICKR (external link) - ZENFOLIO (external link)

  
  LOG IN TO REPLY
Snydremark
my very own Lightrules moment
19,169 posts
Gallery: 58 photos
Likes: 3846
Joined Mar 2009
Location: Issaquah, WA USA
     
Jul 12, 2011 19:04 |  #6

Yep, I'll throw in on the Transcend cards. Been using several of them for 4 years and have had zero issues with them.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

  
  LOG IN TO REPLY
msowsun
"approx 8mm"
Avatar
9,288 posts
Gallery: 18 photos
Best ofs: 1
Likes: 387
Joined Jul 2007
Location: Oakville Ont. Canada
     
Jul 12, 2011 19:22 |  #7

tkbslc wrote in post #12747744 (external link)
All shots go into internal memory buffer of the 7D, so you can shoot 8fps on any speed card. The difference is how fast the buffer can clear out to the card so you can shoot again.

Here is a good video that shows how fast the buffer clears with 80x, 300x, and 600x cards: http://www.youtube.com​/watch?v=iOALy-tYdUk (external link)


Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
Full Current and Previously Owned Gear List over 40 years Flickr Photostream (external link)

  
  LOG IN TO REPLY
Snydremark
my very own Lightrules moment
19,169 posts
Gallery: 58 photos
Likes: 3846
Joined Mar 2009
Location: Issaquah, WA USA
     
Jul 12, 2011 20:04 |  #8

That's pretty cool. Damned pricey to get the 600x/90mb/s cards, though :s


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

  
  LOG IN TO REPLY
phreeky
Goldmember
3,514 posts
Likes: 15
Joined Oct 2007
Location: Australia
     
Jul 12, 2011 20:32 |  #9

If you shoot JPEG, and they're about 7.5MB each, that means 7.5MB*8/s = 60MB/s

RAW = heaps more. Higher ISO and/or sharper images generally = larger file sizes.

The 7D buffer is quite reasonable though. You can hammer away at 8fps in short bursts and generally not worry. It's pretty hard to complain.

Try shooting with a 300D at an airshow, THAT is painful - waiting a few seconds for the camera to start up, filling the buffer in no time, waiting eternity for it to clear the buffer. Ahhh what memories...




  
  LOG IN TO REPLY
00dahc
Senior Member
Avatar
466 posts
Likes: 2
Joined Oct 2008
Location: Seattle, WA
     
Jul 12, 2011 20:33 |  #10

I shoot with some 133x cards both photo and video. No issues. The camera has what's call a GIANT Buffer so we can stop caring about this stuff.


Canon 7D | 70-200 f/4L IS | 50 f/1.8 II | Sigma 30 EX f/1.4 | Sigma 50 EX f/2.8 Macro | Tokina 12-24 f/4 | 430EX

  
  LOG IN TO REPLY
S.n.a.f.u.
Goldmember
Avatar
2,769 posts
Joined Jul 2009
Location: by a river in southern colorado
     
Jul 12, 2011 20:45 |  #11

msowsun wrote in post #12748115 (external link)
Here is a good video that shows how fast the buffer clears with 80x, 300x, and 600x cards: http://www.youtube.com​/watch?v=iOALy-tYdUk (external link)

great video! thanks for sharing.


I'm Russ. Gear List
Life is too short to drink bad wine
-ching chai
Time is a great teacher. Unfortunately it kills all pupils
-Louis Hector Berlioz

  
  LOG IN TO REPLY
KVN ­ Photo
Goldmember
Avatar
1,940 posts
Joined Jun 2010
Location: Jakarta, Indonesia
     
Jul 13, 2011 01:12 |  #12

This may not be helpful, but for 8fps and video recording at HD, the safest way is to use 60 MB/s card.


X-Pro1 + 18-55 f/2.8-4 OIS + 55-200 f/3.8-4.5 OIS
TS-E 24 f/3.5L II + XF 35 f/1.4 + XF 56 f/1.2
Sony RX100 II + G12
Travel the world!

  
  LOG IN TO REPLY
hollis_f
Cream of the Crop
Avatar
10,649 posts
Gallery: 1 photo
Likes: 85
Joined Jul 2007
Location: Sussex, UK
     
Jul 13, 2011 07:17 |  #13

KVN Photo wrote in post #12749747 (external link)
This may not be helpful, but for 8fps and video recording at HD, the safest way is to use 60 MB/s card.

The 7D manual states that video requires a paltry 8 MB/s - anything faster is overkill. As for shooting in bursts, as has been said a couple of times in this thread - card speed has zero impact until the buffer is full, which will be 15-20 raw files or elebenty jpegs. This thread shows the results of some real tests - note that there's no difference at all between a 60MB/s card and a 1.5 MB/s card for the first two seconds..

There are only two good reasons to get a super-fast card.


  1. You often shoot bursts that fill the buffer and have to wait for it to empty. Here card speed can make a difference, up to around 55 MB/s. The 1.5 MB/s card took nearly 4.5 minutes, compared to 11s for a 45 MB/s card. 60 MB/s was a tiny bit faster.
  2. You have a card reader that is faster than USB2 or Firewire 400. Then you'll find images download at a speed limited by the card. But most people don't so they're not going to see the benefit of anything much faster than 30 MB/s.

Frank Hollis - Retired mass spectroscopist
Give a man a fish and he'll eat for a day. Teach a man to fish and he'll complain about the withdrawal of his free fish entitlement.
Gear Website (external link)

  
  LOG IN TO REPLY
RTPVid
Goldmember
3,365 posts
Likes: 3
Joined Aug 2010
Location: MN
     
Jul 13, 2011 15:51 |  #14

hollis_f wrote in post #12750501 (external link)
The 7D manual states that video requires a paltry 8 MB/s - anything faster is overkill....

That would be a class 10 card minimum, using the SD class designation.

This is interesting, since the 7D is an older camera than the T2i, 60D, and T3i, all of which share essentially the same video capability. All four manuals state that the highest resolution / frame rate video (1080/30p or 720/60p) have a bit rate of 330MB/min, or 5.5 MB/sec. The T2i, 60D, and T3i manual recommends a class 6 card (6 MB/sec) for video.

I wonder why the 7D says 8 MB/sec? Maybe they were being conservative, and discovered, by the time the T2i came out, that a class 6 SD card was sufficient.

Many times there is not much price difference (if any) between a class 6 and a class 10 card, but I just find the statement in the 7D manual to be curious. Maybe it has to do with what the speed ratings are for CF cards vs SD cards? I've never looked at the details of CF cards, but is the next level below 8MB/sec too slow for a 5.5 MB/sec stream?


Tom

  
  LOG IN TO REPLY
tkbslc
Cream of the Crop
24,586 posts
Likes: 26
Joined Nov 2008
Location: Utah, USA
     
Jul 13, 2011 17:04 |  #15

8 MB/s is slow for CF, though. Sandisk's slowest current CF is 30MB/s and even 2 years ago it was 15MB/s.


Taylor
Galleries: Flickr (external link)
EOS Rp | iPhone 11 Pro Max

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

3,063 views & 0 likes for this thread
MB/s for 8 fps?
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is Mike1911
893 guests, 248 members online
Simultaneous users record so far is 15144, that happened on Nov 22, 2018

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.