The lightning plug on the apple camera adapter only powers the ipad not the usb device.
Apple lightning to usb 3 camera adapter review.
The lightning to usb 3 camera adapter supports standard photo formats including jpeg and raw along with sd and hd video formats including h 264 and mpeg 4.
A quick visit to the apple support page suggested the use of an additional powered usb hub then connecting that hub to the usb jack on the camera adapter.
If you are going to use this with a usb device probably not a camera but an audio interface ethernet drives etc that does not have its own power source you will have to get an additional 120v powered usb hub for it.
The apple usb3 camera connector dongle allows you to plug both a usb drive or accessory into one port and a lightning cable connected to a power adapter to the other.
Ios then recognized my midi devices perfectly allowing triggering of professional quality music apps such as dm 1 by fingerlab.
However going through reviews of nikon adapter i read one customer recommending lightning cable for the ipad.
Amazonbasics mfi certified lightning to usb a cable for apple iphone and ipad 3 feet 0 9 meters 2 pack white 4 4 out of 5 stars 79 594 14 99 14.
I had no idea apple had lighting cable that lets me transfer photos from my dslr to my ipad.
When we reviewed the ipad camera connection kit back in 2010 we called it a great accessory the single most worthwhile.
After you connect the lightning to usb camera adapter your ipad or iphone automatically opens the photos app which lets you choose which photos and videos to import then organizes them into albums.
I was keen to getting nikon wireless wu 1a adapter for transferring photos from d3200 to my devices.
I bought this from apple when it first came out and bought a second one from amazon last week for nearly 10 less than apple is charging.