If you want to import from a camera simply connect the dock connector to usb adapter to your iPad and connect the usb cable from your camera to the adapter.
If you want to import from a camera simply connect the dock connector to sd card adapter to your iPad and insert your SD memory card.
The iPad will immediately open the Photos app to the Camera tab and display thumbnails of the images stored on your camera or SD card.
If you wish to import all the photos you can press the Import All button at the top right.
Otherwise, press to select the images you would like to import then press the Import button.
Choose Import Selected from the popup menu that appears.
The iPad will now begin importing your photos or video. Notice the blue selected checkmark becomes green once the item has been imported.
Once complete the iPad will let you know that your import has finished. You can choose to Delete the photos/video from your device or memory card. If you want to leave them just press Keep
You can find your newly imported media under the Photos, Albums and Events tab.