if I understand it, you have one card in one of the two slots correct
you then take your photo and the camera says no card correct
did you try switching the card to the other slot and take a picture
if that works, check your settings to see if you only have one of the two slots selected for recording??
not sure you can do that but that is my WAG
let us know what happens
" The K-3 has two SD card slots, something Pentax users (other than 645D owners of course) have been requesting for a while. This is particularly handy given that wireless tethering requires a Flu-card to be inserted. One can thus have the Flu card in one slot and a high-capacity/high-speed card in the other.
With two memory cards inserted, the options for image storage are:
When card #1 runs full, writing continues on card #2
Write to both cards in parallel (thus creating a backup)
In RAW+ mode: Write RAW to one card and JPGs to the other card
In movie mode, you can select which of the two cards is used for file storage. You cannot do so in sequential mode for stills, however: a strange omission. . . .
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Pentax K-3 Review - Highlights and New Features | PentaxForums.com Reviews Pentax K-3 Review - Introduction | PentaxForums.com Reviews Operation Manuals Download : Support & Service | RICOH IMAGING