Camera Labs

From my understanding UDMA means that the card has a very fast write speed, but I could be wrong. Can anyone please provide an explaination, or tell me if i'm wrong.

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Olympus E-400 + 14-42mm + 40-150mm + 70-300mm
http://www.flickr.com/photos/spinner673/

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That's my understanding as well (What is the difference between a UDMA CF card and a standard CF cards?). Only cameras designed to work with the UDMA standard can take advantage of the extra speed, though.

Bob.

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OM-D E-M5 + ED 12-50mm, H-PS14042E, H-F007014E, L-RS014150E, M.ZUIKO DIGITAL 45mm 1:1.8.
Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.

CF cards use the same signalling interface as the older parallel ATA hard disks. With a mechanical adapter you can use it in place of a hard disk in a PC. As the interface evolved through the years, they kept adding new modes for ever increasing speeds. UDMA (Ultra Direct Memory Access) is one of the transfer modes the fastest of which can peak at 133 MB/s. I don't know what modes CF cards actually use though.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.