On the D3 do you have RAW (NEF) and Jpeg or only (RAW) NEF selected?
The follow was snipped from an article at MacWorld, you may wish to read the article.
(www.macworld.com/article/150893/2010/04/ipad
camera_connectionkit.htm)
What does it do with Raw files?
With the camera connector kit, the iPad can upload and store raw image files such as .nef (Nikon) and .cr2 (Canon). While there isn't any way to edit or work with those raw files on the iPad at this time, the iPad does create an optimized JPEG version of each image. You can use that image the same way as you would any other kind of photo on the iPad; include it in slideshows, e-mail it, or edit it in third-party apps. Your original file remains un-altered and will transfer to your computer exactly as it was on the camera or SD card. These features should allow photographers to use the iPad as a storage, preview, and transfer device for their raw files.
The optimized JPEG that they refer to is 2048-by-1360 resolution and if you use the mail function within the IPad Iphoto app, this is the resolution that is sent.
Cheers,