Good morning John,
I had a go with this combination and ended up returning the EyeFi card for a refund.
It worked, sort of, but I think that this combination doesn't have all the bugs worked out of it yet.
The K20 did tether with the ipad but at times not all the photos seemed to want to transfer and I found that the EyeFi lacked control. They try to make it so automated and user friendly and it seems to lack some manual control.
i.e. If several photos didn't upload, I couldn't find a way to manually 'force' them to upload.
It looks like a great option considering how Pentax doesn't care about tethering (K20d can use the Pentax Remote Assistant but it's crap software and no Pentax after the K20 comes with the Remote Assistant)
I would like the Eyefi to work, it would solve a lot of my problems but I just feel that the solution isn't 'there' yet. However, your mileage may vary as they say. When it DID work, it worked quite well and seamlessly. It seemed to work better with my Mac than with my ipad, that may be a reflection on how it has to shoehorn in on the ipad by creating a small local wireless network between itself and the ipad.
I'd advise to give it a try but make sure you can return the card if it doesn't work out for you. You may have complete success with it.
Hope this helps.
Michael
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