About a fortnight ago i bought an adapter card which lets me use an SD Card in my 7D which only has a Compact Flash slot.
I initially saw the item in the shop, but only bought it when i brought in my camera to see that it fitted. Its a Type II (2) which is thicker than a Type I device. It would not fit in the Canon 300D i have at home.
In store i tested it out and saw that writing to the card was slower and after a high speed medium resolution JPEG burst, the buffer took some time to clear. It was around 15 seconds to clear a 20 shot burst. I wasn’t timing. The buffer was showing it could hold 99 shots, so i knew there was no circumstance i’d be planning to take 10 seconds of shots on high speed. I didnt shoot any RAW shots or try and an Eye-fi card.
It got a field test last weekend and I couldn’t tell many differences between the SD card and the CF cards except the buffer kept writing after a few bursts. On the 7D, the reviewing of just taken photo features were still available and you can zoom in and out while its still being written. I had trouble with some review features like rating a just shot photo 5 stars, but could do so after.
The only other thing of note is that the card i used was missing the write/locked switch which couldn’t be written to on a computer, but was writeable on the camera with the CF adapter.
I’m happy to keep using the card and I can see it coming in handy if i wanted to do a liveshoot and upload photos minutes after it was taken. I’d be taking a MicroSD card in a SD adapter in a CF II adapter from a 7D and putting it in a mobile.