I have got the setup working to wirelessly transfer RAW files from Hasselblad CFV 16 digital back to the iPad Air.
- Eye-Fi Pro X2 16G SD card;
- Digigear SD SDHC SDXC to CF tpye II CF Ultimate CF Adapter (available on Amazon or B&H);
- piRAWnha RAW editor for iPad.
Basically, the approach is to open piRAWnha application, and tap "LOAD PHOTO" to open the Eye-Fi folder. Eye-Fi can generate and display a very small JPEG file from the RAW, which is perfect for selecting the photo to be opened in piRAWnha. After the new image is captured, just hit the refresh icon, and the "Eye-Fi" folder will get refreshed with the latest images. The Eye-Fi transfer speed is about 20 second for CFV, and piRAWnha can open or convert the RAW within a few seconds.
I also tested this approach using Android. The Hasselblad RAW's JPEG is not viewable in Android's Eye-Fi version, but you can still use the "Raw Decoder" application to open the selected RAW file. So while it is less convenient, the same wireless approach also works for Android.
Hope this information will help those photographers looking for an instant viewing solution without tethering a laptop. It may be especially useful for those who use some old digital backs that have a poor screen.