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Photo Forum / Digital Photography / Digital Photo / August 2005What speed SD card for canon IXUS 40 ?
In the manual for my camera, canon seems to recommend a particular SD card so that it's fast enough to store high quality movies without running into speed limitations. It says to use a high speed card, SDC-512MSH recommended. Well, I have no idea what they think is high speed. Is 45x high speed ? 66x? 150x ? I haven't been able to find any information on what speed that recommended card is. The only useful sites on google seem to be in Japanese. Does anyone know what speed card is good enough for the camera - such that any higher speed is wasted ? For instance, if a 66x speed SD card is good enough for the camera to record at maximum resolution, maximum frames per second movies without limitation, and if you're not going to get any more frames per second in continuous shooting still mode, then there's no point getting a 150x speed SD card, correct ? How about the speed of reading from the SD card, across USB to the PC ? Will a faster SD card speed up the process ? At what speed is a faster SD card a waste ? What is the maximum speed that this camera can actually read and write to an SD card ? It's not in the camera specifications. Thanks for any help... Chris > In the manual for my camera, canon seems to recommend a particular SD card > so that it's fast enough to store high quality movies without running into > speed limitations. > > It says to use a high speed card, SDC-512MSH recommended. If it has the words "High Speed" in the description then it is a High Speed card. Otherwise it is normal speed. > Well, I have no idea what they think is high speed. Is 45x high speed ? > 66x? 150x ? I haven't been able to find any information on what speed [quoted text clipped - 20 lines] > > Chris  SignatureCSM1 http://www.carlmcmillan.com -- >>In the manual for my camera, canon seems to recommend a particular SD card >>so that it's fast enough to store high quality movies without running into [quoted text clipped - 5 lines] > card. > Otherwise it is normal speed. OK, so you're saying that the manufacturers actually all use the correct terminology to refer to particular speeds of cards, and that they don't just use whatever term they feel like, and refer to their cards as "high speed" even though they're not as fast as their competitors that also advertise theirs as "high speed". And the "high speed" that Canon is talking about is the same "high speed" as the manufacturers use. That's good. So, any idea if getting a card faster than my camera needs will actually help in any way - like improving the speed that the pictures download across USB ? I figure that if a 66x card is high speed, and is 10Mbps (I've seen both those figures on a card), then that's going to be the limiting factor when downloading over USB2, which can go up to 480Mbps. If the canon camera can support the ultra speed 150x SD card, then that'll better than halve my download times, correct ? So, does anyone have any idea what the maximum speed of the canon is when talking to the SD card ? Thanks, Chris >>>In the manual for my camera, canon seems to recommend a particular SD >>>card so that it's fast enough to store high quality movies without [quoted text clipped - 32 lines] > > Chris The sales department of all manufacturers seem to inflate their claims, but some terms can not be inflated. Your camera will only use whatever speed the controller built into the camera can operate at, putting in a faster memory will not speed up a memory transfer if the controller in the camera is designed for slower memory. If the camera has a USB 1.1 controller (a lot of cameras do), then the maximum speed of file transfer is 12 Mbits per sec or about 1.5 MB per sec. The best way to get a fast image transfer is to use a Card reader. USB 2.0 card readers are cheap, you can find them for as little a $5-10 some places. SignatureCSM1 http://www.carlmcmillan.com -- | > The only useful sites on google use Yahoo. Google calls itself an engine, this is stupid. | > speed of reading from the SD card, across USB to the PC ? Sandra, or *Disk chckr from www.rssoftlab.com , can tell you this speed. My PenDrive 512mb ( via Apacer's reader, on USB2 ) hit 7800 kb/s in *. | > Will a faster SD card speed up the process ? I believe no. Chk 1st whether camera's reader is as good as an external 1. My FX7's is not. Sandra www.sisoftware.demon.co.uk/sandra/ 's ports information page can report your camera / card reader's attributes, e.g. < Root Hub: USB Port 2 > Status: Device Connected Device Connected to Port: USB Mass Storage Device OEM Device Name: Alcor Micro Corp. ??? (6369) Device Version: 1.19 Device ID: VEN_058F, DEV_6369, PRT_00 USB Version: 2.00 Speed: Full (12Mbps) Configuration Settings: 1 Open Pipes: 2 Transfer Type: Bulk Data Packet Size: 64 bytes | > At what speed is a faster SD card a waste ? www.sdcard.com/europe/TextPage.asp?Page=2 says max speed is 10 mb/s, so claims of higher speed may be bluffs, or possible only in their own over clocked card readers. >>> The only useful sites on google > use Yahoo. Google calls itself an engine, this is stupid. [quoted text clipped - 27 lines] > so claims of higher speed may be bluffs, or possible only in their > own over clocked card readers. OK, so someone wrote that this is max speed, and you already believe it? First see some other reviews of latest cards (like SanDisk Extreme) and you will see practical write and read tests (not ones by manufacturer), which exceed 10 M rate. Not all testers are liars... It is a question though WHO actually needs such speed at the moment? Since best cameras who can make big number of shots in a second would need it, but instead have big internal memory buffer (like canon's MarkII has 512 M buffer) and they transfer pics to a card when you release the shutter... i think you can make up to 30 shots in a series max, so, Canon doesn't even bother TRYING to transfer data that fast, since probably noone really needs it. Note that in max speed of transfer card would be full in a few seconds. Who would exchange cards every couple of seconds? This high speed will be usable in the future, when cards will be bigger (like 16, 32G) and cameras way better. Hi speed card may be a waste, but in real world normally you buy a quality card, so loosing your pics is less possible. And buying quality cards in the same time means buying higher speed one...So, you just can't buy a quality slow card. OK, i bought SanDisk Ultra II 1G one...i didn't even look at speed, only quality.... > In the manual for my camera, canon seems to recommend a particular SD > card so that it's fast enough to store high quality movies without [quoted text clipped - 26 lines] > > Chris just see in your manual how much of space is one second of a movie - for instance S2 at 640x480 at 30 fps takes 1980 kbytes per second, while at 15 fps takes 990 kbytes per sec, then at 320x240 needs 660 vs. 330 kbytes per second (30 vs. 15 fps). So card must be capable of taking 2M per second minimal. Since 1x speed of a card means 150 kbytes per second, it's easy to calculate which speed you need...for instance in my case 1980/150 ---> with some reserve at least 20x speed. If you have less quality movies in your camera, any card will do. In that case look for quality, not speed, so in any case don't buy cheapest one (i think some SanDisk Ultra II is quite perfect). These ultra speeds are more needed at pro cameras, where they can make over 10 shots per second, and in this case card really needs to be quick in order to receive that fast data- >>In the manual for my camera, canon seems to recommend a particular SD >>card so that it's fast enough to store high quality movies without [quoted text clipped - 40 lines] > 10 shots per second, and in this case card really needs to be quick in order > to receive that fast data- Cool, great advice thanks. I get about 7 or 8 seconds of 640x480/30fps (the best my cam can do) on my provided 16MB card, so that looks like about 2MB/s, same as you quoted for your camera. So, as you say, anything better than 20x speed will suite me fine. I'll get a 66x (probably sandisk ultra 2) and not look back. Chris >>> In the manual for my camera, canon seems to recommend a particular >>> SD card so that it's fast enough to store high quality movies [quoted text clipped - 52 lines] > > Chris Good choice. Good, reliable card-- |
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