Dissapointed with SanDisk extreme iii class 10!

Robbo

Robbo

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Got my new card today, minimum transfere rate of 10mbs, maximum of 30mbs.

So when shooting in raw, 15mb per picture ish, and the camera bank holds 6, shooting 3.5 max a second.

So just call it 6 pictures in 2 seconds, 2 seconds giving me at least 20mb transfered to my card........

...... Why does it pause still before the 7th shot?! Like it did with my class 2!

Surely with this class 10 card after a two second burst shot I should be able to take more than the 6 the camera bank holds without a pause?!
 
Just guessing but I reckon it's probably the camera's write speed that's slowing things down.
 
:plusone:
Your max transfer rate will be dependent on the slowist link in the transfer and this would seem to be the camera write speed.
 
even if it peaks at 14 which is roughly 1 raw file, so one raw file a second, surely I should at least get my 7th shot without a pause, as it has it has two full seconds to transfer 14mb the sdhc card to release one space in the camera bank for that 7th shot.
 
Nope, because the chances are that the number of files cleared by card A isn't necassarily a full shot behind card B. However perhaps shoot a few jpeg files and you might see the burst increase from A to B. The biggest benefit of the new card will of course be the transfer to the PC!!
 
Hi, from Canons site re spec and the buffer in the camera

Continuous Shooting Max. Approx. 3.5fps. (speed maintained for up to 53 images (JPEG)¹, 6 images (RAW)) ²

I had this to hand as a mate at work was asking a very similar question the other day.

Hope this of help :thumbs:
 
Tried turning off the in camera noise reduction?
 
trencheel303 said:
Tried turning off the in camera noise reduction?
Click to expand...

yes got the noise reduction off.

My camera shoot the 6 in raw straight off. which take about 2 seconds.

My transfer rate of the camera is 14mb (ish)

minimum transfer rate of the card is ten mb/s

so in 2 seconds of shooting, surely I should have had roughly 20mb transfered onto the card, freeing up 20mb on the camera bank, freeing enough space for one more 14mb raw file.

So surely I should have at least 7 pictures in a raw without pause.
 
In that case then the limitation is the camera as per Canon's spec. It'll rattle off loads of JPEGs but it won't do loads of RAWs as quickly.

Quite why, when JPEGs have to be processed by the camera when RAWs do not, is a mystery, but I suspect it is an intentional limitation to make people buy better cameras.
 
8MB/s card, over two seconds is 16MB/s or one RAW
14MB/s, over two seconds is 28MB/s. So thats 12MB/s extra cleared from the buffer compared to the original card. Not enough for the extra RAW.
 
trencheel303 said:
In that case then the limitation is the camera as per Canon's spec. It'll rattle off loads of JPEGs but it won't do loads of RAWs as quickly.

Quite why, when JPEGs have to be processed by the camera when RAWs do not, is a mystery, but I suspect it is an intentional limitation to make people buy better cameras.
Click to expand...

the delay between the 7th shot from my old card is noticabely shorter......I am just dissapointed as I expected more from it....n/m
 
JEmerson said:
8MB/s card, over two seconds is 16MB/s or one RAW
14MB/s, over two seconds is 28MB/s. So thats 12MB/s extra cleared from the buffer compared to the original card. Not enough for the extra RAW.
Click to expand...

Yes it is.

The card will clear at least 20mb from the camera bank over the two seconds of continus shooting as it has a transfer rating of at least 10mb/s

10 x 2 = 20

Freeing 20mb from the camera bank, a raw file is only 14-15mb.

The only thing I can think of is if the transfer from camera to card doesnt start till the burst has finished?
 
I think you might be expecting too much from a consumer product. There are posts in this very thread explaining why you are having this problem as well. It's a design limitation.
 
trencheel303 said:
I think you might be expecting too much from a consumer product. There are posts in this very thread explaining why you are having this problem as well. It's a design limitation.
Click to expand...

I am not expecting to much at all.

I am expecting 1 more picture from the standard 6 it can do with a bog standard 2mb/s card.

There is no limitation as I have explained with my maths.

6 pictures in 2 seconds. (even with 1.5 seconds it should produce minimum transfer of 15mb, enough for a raw)

2 seconds would give MINIMUM of 20mb transfered from the camera to the card and maximum of 28mb.

Freeing 20-28mb from the camera bank within the 2 second shoot.

A raw file is 14-15mb.

20/15= 1.3 working off the minimum

Anyways, its a 'bit' faster, but even on the computer side of things I was expecting more. Live n learn
 
trencheel303 said:
I don't think it can possibly be made any clearer.
Click to expand...

but surely the camera will start to transfer the imformation to the card while shooting emptying the bank as it goes along?

Or is that just a sensible idea that canon thought they would miss out.

God damnit lol!

I blame my night shift and no sleep for my silly brain fart :bonk:
 
It says 'speed maintained' for 6 (RAW).

The whole point (and what several people have been trying to tell you...) is that the camera will shoot 6 RAW images and then start to stutter. It's a limitation, if you want more FPS you have to get better kit.
 
trencheel303 said:
It says 'speed maintained' for 6 (RAW).

The whole point (and what several people have been trying to tell you...) is that the camera will shoot 6 RAW images and then start to stutter. It's a limitation, if you want more FPS you have to get better kit.
Click to expand...

I am not after more fps, I was getting a card anyways, I just assumed the 6 raw held in the bank was what the camera could hold, not realising it was its maximum burst at the same time
 
the camera's buffer and write speed are probably the limiting factors in this case. it probably takes 6 RAW images to fill the buffer up, and then the camera's writer isn't fast enough to clear up enough space in time for your 7th shot. even if you popped in a UDMA card, i doubt the 450d could clear the files quickly enough to go over what canon have already specified.

the xxD series (40d onwards) will definitely be able to make full use of the write speed of sandisk extreme III cards. the UDMA cards should be used with the single-digit bodies (5d mkII and 1-series mkIII onwards) for best effect.
 
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