Nikon, for instance, has engineered their cameras around Lexar cards, and I've had good success with those cards in my Coolpix 4500. On the other hand, when I tried a Sandisk Ultra (rated fastest in those days) it was slower than the 12X Lexars on that camera.

Nikon now also supports Lexar's proprietary Write Acceleration (WA) technology, but only on more recent, up-scale cameras. Again, a waste of money to buy a 40x WA Lexar card if the camera doesn't make any use of it. At least Nikon publishes a list of tested cards in the back of their camera manuals (unlike Canon). You can also get info on recently tested cards on the Nikon camera tech site.

You should be able to extrapolate to larger size cards from there, but I wouldn't stray from the manufacturers listed there, unless you get a chance to actually check out a card in your camera in a camera store. Don't forget to be nice to the sales folks there, and buy something there, for their time and trouble, instead of saying, "Cool, now I can order this from Amazon!" After all, what good does it do you to save a few bucks on an initial CF purchase, if it doesn't do what you want? Kind of an expensive keychain charm, if you ask me.

I recently got a Canon EOS 300D, and was dismayed to find that Canon support wouldn't tell me what speed or manufacturer of card to use with the camera (I suppose the engineering department used core memory for their tests, for all I know). Since I bought a Digital Rebel before any flash tests with that camera appeared on http://www.robgalbraith.com, I was pioneering. I subsequently discovered that Canon was selling Simpletech 10x cards on their web site as 300D accessories (imagine that 8-), so I ordered a couple from Amazon (*much* better price 8-), and have been happy with them. Not the fastest in the world, but the price was right, and they work OK with camera.

Since then, I've seen the review on http://www.robgalbraith.com (as of 11/28/2003, they had tested with 16 different cameras -- also check out an older survey at http://www.dpreview.com, that may cover your camera), with the Sandisk Extreme topping out the list for the 300D. I ended up here, looking for Extremes, but Amazon doesn't seem to be carrying any. 8-(

Sandisk Ultra II's and the "new" Ultra (see the robgalbraith article) rated very closely to the Extreme, though.

If you have a Digital Rebel (EOS 300D), the Ultra II 512MB should work fine for you. Also, to all those folks that say you can get 100+ photos on a 512MB card, you obviously haven't discovered the benefits of shooting in RAW mode. Of course, if you shoot in RAW, you can't squeeze quite as many shots on a card (about 64, +/-) but it's still about the equivalent of two rolls of film, which is OK in my book.

If you do shoot RAW, do yourself a favor and check out Capture One DSLR Digital Rebel edition (http://www.pictureflow.com/). It's cheap ($49), fast (instant preview of your changes, and you can queue RAW conversions for background processing), and will make working with RAW photos a pleasure. Nothing like being able to fix an exposure problem +/- 2 stops *after* you shoot it, and the 'click here' color balance correction is golden. A RAW file is a lossless compression with 12-bits of data, so if you convert to 16-bit TIFF, you can edit to your heart's content without seriously degrading the image (unlike 8-bit JPEG).

If you have a 300D, you've bought a first-rate sensor and electronics (same as the more-expensive 10D). Don't cripple it by shooting JPEGs. Have fun, and explore what your camera can do.

Works fine - but not from Amazon (Rating: 5.00)
Review : I have two of these, one in a Canon Powershot S500 and the other in a Powershot S1 IS and both work fine. No problems at all.

The ordering issue was something else, eventually I gave up on Amazon's extended and extending delivery times and bought them on Ebay for $10 more. I buy a lot of gear from Amazon and I was disappointed this time, but that's one in a hundred where they have totally failed my expectations, not bad overall.

It's a fast memory card, it works, it's available on Ebay. What else is there to say?

Got mine from Amazon. 60X write, 66X read. (Rating: 5.00)
Review : I pre-ordered this item from Amazon. Apparently, there was an initial delay with Amazon's supply, but I just got mine. With a price like this and free shipping (which, despite being "Super Saver," was speedy as usual), I have no complaints.

Works fine so far, and the capacity boost over my old 64MB card has me almost giddy: The "pictures remaining" counter on my 3MP camera jumped from about 40 to over 300.

Helpful info: The manufacturer's "X" speed rating equivalent, which isn't easy to find online, is 60X write and 66X read.

Canon Digital Rebel (Rating: 5.00)
Review : This is the card you want if your getting a Digital Rebel! The 512 will get you about 142 pictures.It downloads fast ,and gives you great pictures,what more do you want.If you are spending at least 1000 dollars on a camera don't go cheap on the compact flash cards! Get a good one! This card I got online for about 150 dollars.Make sure you are getting the Ultra 2 not just the Ultra there is a difference the Ultra is good but not as fast as the Ultra 2 ,you will be thankful you spent a few a

extra bucks and got the best card for the Canon Digital Rebel