Pretty much as what the title asks. Any ideas anyone? Is there any particular, technical limitation for using this technology with CF cards?

  • On Eye-Fi supporting CF cards, I think it would be best to ask them. On the alternatives, I don't suppose you tried using an Eye-Fi in a SD-to-CF adapter? No other options come to mind. – Itai Jan 24 '11 at 16:17
  • @Itai - I dod not try an adapter, and from what I have read they are limited in their usability. I hope maybe one of the forum member has actual experience with using such device in his CF only camera, so we can all learn from a 1st hand experience. – ysap Jan 24 '11 at 16:24
  • My understanding is that the adapters work best when shooting JPEG, that trying to shoot raw usually results in failure. – John Cavan Jan 24 '11 at 16:28
  • Edited to make the question answerable without having to speculate about EyeFi's business model. – Jay Lance Photography Jan 24 '11 at 18:02

Here is the latest answer on CF adapters for the 5DmkII and the 7D, on our site.

Instant Photo Transfer from CF Cameras


Ziv. Eye-Fi co-founder

  • @mattdm - I've updated to the latest information. Looks like it's now coming to a CF card near you... :) – John Cavan Mar 13 '15 at 13:01

Thus far, Eye-Fi does not support compact flash. They have a page on their website that lists known issues when using an adapter. These issues include a reduced wireless range of the Eye-Fi card as well as a potential for file corruption.

I'm not aware of any competitor's products which offer similar functionality in a CF card. I do note however that it seems DSLR manufacturers are starting to move to SD from CF, with newer models from both Canon and Nikon favoring the SD cards.

  • @ahockley - yes, I have found that page on their website. I was wondering if there is a particular reason why they do not support CF. – ysap Jan 24 '11 at 17:27
  • If you want the true reason from the company, you'll probably get a more accurate answer by asking the company than by asking here. – ahockley Jan 24 '11 at 17:48
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    How would anyone here on photo.se.com know the answer to 'why'? – Jay Lance Photography Jan 24 '11 at 18:02
  • @Jay Lance Photography - the intent is to ask about the technical reason, not their business model/decision. Anyway, I accept your edit. – ysap Jan 24 '11 at 18:11
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    @yasp more likely is the commercial viability -- SD is defacto for consumer cameras and entry levle DSLRs which gives a wide possible audience. CF is generally used by higher level cameras and most of those support tethered shooting which would eat in at the people wanting the product. – Rowland Shaw Jan 24 '11 at 18:22

There seems to be some evolution on that point. Eye-Fi seems to be willing to offer CF support, by certifying CF adapters for their SD Eye-fi, starting March 2015. More infos on their website:


You will find a how-to guide and a list of compatible cameras. And also some words on possible drawbacks, like slower transfer times.

  • That's good news... From their website looks like the technical problem we were questioning about was the regular metal casing of the CF cards (that would not explain, though, what prevents them from actually making a custom CF card with WiFi). Nevertheless, the certified adapter should work just great. – ysap Mar 13 '15 at 12:41
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    <sarcasm> Now that it took them 4 years to finally answer to our request, let's hope that the market price for the EyeFi cards will get reasonable before we have to replace our aging non-wireless cameras... At an age where an 16GB SD can be bought at some $8, they sell their EyeFi for $60 (dang, I can see a whole wireless adapter grip kit for $105 for my 7D). </sarcasm> – ysap Mar 13 '15 at 12:44

I strongly doubt there's a technical reason. I'm sure that they just don't see offering a CF version as profitable.

  • see my comment to Rowland Shaw at ahockley's answer. – ysap Jan 25 '11 at 14:05

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