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I got the adapter to be able to use an eyeFi card in a Canon 7D. The adapter is decent quality, and fits the 7D slot well, however the speed of the adapter is quite slow.
The 7D has no problem recording 1080p video on a 133X CF cards. Same can be said of the class 6 AData SDHC in Canon T1i, however the AData in the adapter is not fast enough to record video from the 7D. Now this is not a big deal as the real benefit of the adapter was in geotagging photos via eyeFi. Problem is that the eyeFi is not even class 6 SDHC, so even shooting photos, it takes about 10 sec. in the adapter to write per raw photo. The relatively cheap 133X CF takes about 2 sec for the same file.
I know the 133 CF can write at 32MB/sec (new ultra pro cards to 90MB/sec) during a computer copy test. I did not test the class 6 in the adapter, but based on camera results I'd be surprised if it was faster than 5MB/sec.
If you only shoot JPEG or have a camera with a smaller image size, and need to use eyeFi - this may work for you.
UPDATE 1yr later:
I've REALLY wanted to make this solution work - but a year after getting the X2 Pro card and the adapter I have to say that, at least for Canon cameras with only a CF slot, your best solution is to get the Canon WFT adapter. Yes it costs way more, but here is the problem: With an eyefi card in a CF adapter, the electronics of the camera wrap around the package and greatly reduce the distance (and speed) of the eyefi card. In fact they reduce it to the point of frustration and non-usability. You can get a signal 10ft out, but the speed will be close to 1Meg, not 50 or 270 you are used to. It gets a bit faster as you get closer, but that defeats the purpose.
The only real solution is to get the WFT, which accomplishes what you really want. The other option is to get a 60D which has an SD slot and use that for your studio work (where a weather seal is not needed). I decided to go that route rather than spending the money for the WFT for my 7D. Getting the 60D gave me one more backup body (uses same battery) and cost about 2X what the WFT would have cost. In the 60D the eyefi works MUCH better than using a CF adapter - although I think the eyefi works fastest in small cameras with little electronics near it to mess with the RFI.
I know you'd like to spend $20 and get wifi, but reality is that a camera like the 7D has too much internal RF noise to work reliably with an adapter, hence and external WFT is sold.
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Works for ipod compact flash conversion.
Reviewed in the United States on May 17, 2013
Bought this adapter to use with an ipod that had no hard drive. I used a fairly cheap Lexar 32GB sd card with mine, as well as a cheap compact flash to 50 pin adapter. I'm happy to report that it has worked flawlessly. I've used it for a few weeks now with no problems. No heat whatsoever. Battery life has improved by about 2 hours with every battery test, transfer rate is about the same, and no crashing during a large transfer. I plan to do a test with a 64 GB sd card from a friend just to see if this adapter can handle it.
Reviewed in the United States on May 17, 2013
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