SanDisk 4 GB Extreme IV CompactFlash Card vs. SanDisk 4 GB Extreme III ?

Question

What is the difference in between these CF cards besides the higher speed of data transferring of SanDisk 4 GB Extreme IV CompactFlash Card ? Is this difference crucial?

Thanks!

Answer 1

The difference is the write speed. I have used both with my D300 and they have worked well. The faster card would only be really important shooting RAW at fast frame per second rate. RAW files are more data so shooting them fast you do need a fast card to get the data recorded as fast as the camera can shoot. So for most people no its not crucial.  

Answer 2

The difference is in UDMA technology. Not all DSLR's are UDMA compliant though, so the difference is really nil. Like a dummy, I bought a 4GB Extreme lV CF card for my EOS 40D without first researching it. And the 40D is non-UDMA compliant, so the speed is really about the same at that of a Extreme lll, which is a lot cheaper. Hey, you live and you learn, right? Here is a short article on the features of the Extreme lV.

http://www.bhphotovideo.com/c/product/44...

Note: Look under the "features" tab for the info...

Also:

http://dpnow.com/4445.html

Answer 3

I use the extreme 3 cards because they are cheaper and far exceed the write speed available on anything other than a Canon EOS 1Dmk3 at 10fps.

Unless you are using a Canon EOS 1Dmk3 then you have no real need for the extreme 4s.  

The Extreme 3s are very relaible and very fast, outstripping most DSLRs.