Not in ad-hoc mode, no.
Apps only get access to one network connection.
That connection is prioritized by the system like this: First Wi-fi then the Personal Hotspot and lastly the mobile data network.
So if you need Internet access with only an iPad and your camera handy, you'll need a Verizon "New iPad" (as far as I remember they allow the Personal Hotspot feature - check with the carrier before you buy, don't take my word for it..).
You would then start the Personal Hotspot and connect to it with your WFT (not ad-hoc) and there you go, Internet access!
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