Digital Camera Repair Questions? Ask a Camera Expert.
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To answer your question as well as is possible:
1: A wireless card is not storage, so it is not comparable to a regular memory card in point of storage for images. Unless it is a storage-and-wireless card, in which case, consider its rated total capacity in GB (not in GBits of transmission/reception, but in GBytes of storage.)
2: WiFi cards are not compatible with all camera models by any means. I found one on a basic search but it is only compatible with 3 Canon cameras, the page says: 7D Mark II (Stills and MP4 videos), 5DS (Stills only) or 5DS R (Stills only.)
Was there any particular WiFi card that you had in mind, please? let me know.
I will advise you further. Thank you.