No, not at all. As i said it will be nice to have a discussion on this as I may not know it all, and am willing to get the correct information. So, I googled and found that there are couple of things needed for tethered shooting.
1. Camera that communicates via wifi. Nikon does not (only avialable in their pro body range) , but i read that most of the Canon bodies have this feature.
2. Eye-fi memory card if camera does not communicate via wi-fi.
3. Wi-Fi router - this is needed to create a channel between the camera and the iPad as iPad cannot create a hotspot. ( correct my undersanding on this one, if its wrong)
Still i think this set-up is lighter than carrying a laptop, but the only thing that i dont find satisfying is the high cost of the Eye-Fi card (as i use a nikon

)