Q: Can you connect your iphone5, digital camera, and USB flash drive to ipad2 ?

Digital Camera yes.

Camera Connection Kit

http://support.apple.com/kb/ht4101

iPhone, you probably need a 3rd party app like iTransfer.

The iPhone cannot be connected to the iPad...you have to sync the photos or transfer through iCloud using PhotoStream.

Some people have been successful in using a flash drive when formatted for photo use but that is not truly supported.  The camera connection kit is for direct transfer from the camera or memory card.

You can transfer photos between iPad and iPhone via WiFi or Bluetooth using an App like Photo Transfer.

You can use a USB flash drive & the camera connection kit.

Plug the USB flash drive (works the same with an SD card) into your computer & create a new folder titled DCIM. Then put your movie/photo files into the folder. The files must have a filename with exactly 8 characters long (no spaces) plus the file extension (i.e., my-movie.mov; DSCN0164.jpg).

Now plug the flash drive into the iPad using the camera connection kit. Open the Photos app, the movie/photo files should appear & you can import. (You can not export using the camera connection kit.)

Using The iPad Camera Connection Kit

http://support.apple.com/kb/HT4101http://support.apple.com/kb/HT4101

iPad: Using iPad Camera Connector with unsupported USB devices

http://support.apple.com/kb/ht4106http://support.apple.com/kb/ht4106

Secrets of the iPad Camera Connection Kit

http://howto.cnet.com/8301-11310_39-57401068-285/secrets-of-the-ipad-camera-conn ection-kit/http://howto.cnet.com/8301-11310_39-57401068-285/secrets-of-the-ipad-camera-conn ection-kit/

 Cheers, Tom

Yes, that can be done...what I meant by some people being successful with a flash drive. The drive has to be formatted FAT32 if I remember right and can only be used for images recognizable as camera files, DCIM.  Some want to use the drive as a mass storage but that doesn't work.

At the price of flash drives today, and only $30 or so for the camera connection kit, you can hardly go wrong giving it a try.