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G9 supported SDHC class?

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I have the sandisk class 2 4gs and as you say it writes slowly. I am wondering if I should have waited for class 6 which was out of stock.
How big an SD card can one use in the g9?
--
fredyr
 
and yet to unpack it... i wonder y it is stated in the SD offical web the class 6 is rated at 6MB/s only... the Ultra 2 stated in its package the speed is at 10MB/s with no class info.. the toshiba card i hv got has 20MB/s specifeid on the package.

any hints?
 
Read this review at digitalcamerainfo.com :

http://www.digitalcamerainfo.com/content/Canon-G9-Digital-Camera-Review-15723/Testing--Performance.htm

They benchmarked the write speed at 1.6 sec for a 5.4 mb photo. That is 3.37 mb/sec write speed.

Despite the advertising, a typical class 6 card will have actual write speed of around 3.5 mb/sec. A class 2 card will write at around 1.5 mb/sec.

A G9 RAW file is about 13 mb in size. If you use a class 2 card with a G9, you will be seriously bottlenecked by the card.

The Facts:
  • The G9 RAW files are huge.
  • The G9 is capable of write speeds of 3.5 mb/sec or more.
  • The G9 needs seriously fast cards.
 
doryman said:
Purchased an Extreme III 4 gig card aweek ago for my new G9. It
dosn't say class anywhere that I can tell only 20MB/s and 130x which
I thought was slow as other cards boast a 150x( Transcend). Happy
with the card though and it came with a reader from amazon.
Click to expand...
Your Sandisk card should say SDHC on the front of the card. The Sandisk SDHC 4GB is a class 6 card, so it is guaranteed to have, at least, 6 MB/s sustained write speed.

The problem with the 150X, 200X etc, is you have to read the details to know what that means. Often time this is reading speed only and writing speed, which has the most impact on your cameras's performance, is much slower. The SDHC spec cleared this up.

jerry

--
jerryk.smugmug.com
 
Fredy Ross said:
I have the sandisk class 2 4gs and as you say it writes slowly. I am
wondering if I should have waited for class 6 which was out of stock.
How big an SD card can one use in the g9?
--
fredyr
Click to expand...
]
To fully support the SDHC spec a camera would have to support a 2,048 GB card!!!

FWIW, I am using a 8G, class 6 Transcend card and it works fine. Also, it was inexpensive ($75).

--
jerryk.smugmug.com
 
it is claimed 10mb/s on the package but did not tell what class type it is...

anyone know about it?
 
That speed would be faster than class 6 specs, but I would bet in real world use it would be the same as class 6 or slightly faster.

BTW, the claimed write speed on the Ultra II is 9 mb/sec. 10 mb/s would be the read speed.
 
Eden Yip said:
it is claimed 10mb/s on the package but did not tell what class type
it is...

anyone know about it?
Click to expand...
Sandisk does not have an class information on their website about the Ultra II. However, some sites have listed it as Class 6. It seems to be an average/good performance SDHC card. But, kind of expensive.

--
jerryk.smugmug.com
 
I use Transcend SDHC 8 GB class 6. The

write speed is around 13 to 14 MegaBytes per second

reading speed is around 18 to 19 MegaBytes per second

the write speed is almost perfect for the G9, because during RAW shooting, you will need 13 to 15 MB per picture. SO you can take every second or every 2nd second.

Dont buy slower cards, it may be risky if you try RAW with class 2 cards.

--
http://www.zeeshan.de/
 
dudelsack said:
Thanks for all the replies... I am NOT concerned that a SDHC class 6
card will NOT work with the camera, I just do not want to spend the
money on a class 6 card if the G9 only supports class 2.
Click to expand...
Class 2 is minimum 2MB/sec or 13X. Believe me, this you do not want. The last time I bought a 16X card was in 2002!!

Class 6 corresponds to minimum 6MB/sec or 40X. This rating is virtually meaningless, as virtually all but the cheapest cards these days are faster than 40X. Many SDHC cards, e.g. Extreme III, are much faster than this.

If you get a 40X card, you may have trouble with video - you should be looking at a minimum 60X card. Do your homework, make sure the card speed rating is a sustained speed (sometimes called "minimum" speed"). Many off-brand cards are rated at 120X, but this represents a peak or burst rate. When writing a 5-8mb image file, some of those "bargain" high-speed cards have trouble sustaining 20X speed.

After spending $500 or so on a camera, my advice is not to cheap out on the card. There are many bargains and counterfeits out there that are just waiting to trash your images or melt in your camera. Buy at least a 60X name-brand card from a reputable dealer. Sandisk, Lexar, Kingston, Transcend, ATP have been pretty reliable. cheers, gkl
 
tfar said:
In my opinion, the question whether the G9 can write to a card at a
speed a Class 6 card can take, is a very valid question.
Click to expand...
Class 6 is only 40X. The Sandisk Extreme III easily exceeds that minimum standard - it's rated at 133X according to their online data. You shouldn't have any issues with a G9 writing to Extreme III. cheers, gkl
 
http://www.dpreview.com/news/0606/06062801toshiba4gbsdhc.asp

"The SD Speed Class Ratings specify a minimum sustained write speed for SDHC cards (Class 2: 2 MB/s; Class 4: 4 MB/s; Class 6: 6 MB/s)."
Thomas Niemann said:
Sandisk Ultra II, 4GB, is class 4, says this on the card.
Click to expand...
Sandisk's website says Ultra II is 9 MB/sec, but they no longer specify that this is a sustained rate (they used to). If it is sustained, it would exceed Class 6 rating. I suspect they picked Class 2 for their vanilla cards, Class 4 for Ultra II and Class 6 for Extreme III,

as there are no higher classes in the current SDHC standard, and consumers don't know what the classes mean anyway. cheers, gkl
 
Jerry, thanks for clearing that up. From now on I will be looking for write speed info. Or, I may just order another Sandisk E III card. I am quite satisfied with the speed of the Extreme III after using much slower cards in my S50.
 
This is because no camera, MP3 player or PDA can ever come close to the maximum speed of any given card in a fast computer-based card reader. The manufacturers' optimistically high (e.g. 66x, 133x) speeds are based on benchmark tests when the card is run in an optimized PC-based card reader -- and in addition, many card manufacturers rated their cards by read speed, and don't mention write speed at all whatsoever. Currently, the fastest-writing digital camera can barely sustain 9 MB/s (60x) in write speed. And some cameras cannot take full advantage of an SD Class 6 card even in continuous shooting mode at high ISO sensitivity settings with fine/superfine JPEGs or RAW images.
 
I don't have a G9 yet, but I do have a Kingston 4GB Class 6 SDHC card. I'm wondering if you guys can shoot bursts in RAW format with the G9? If so, can your class 6 SDHC card keep up? Or RAW can only be used on a per shot basis even with a Class 6 SDHC card?

Also, can you shoot in RAW only or it's RAW+JPEG?
 
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