It is surprising how easy it is to transfer/import photos from your digital camera to your iPhone/iPad. There's absolutely no technical stuff involved except of course one little gadget that makes it all possible: the lightning to USB camera adapter.
Once you connect both the camera and the iPhone/iPad via the adapter, your iDevice becomes smart enough to read the camera, the photos in it and lets you import them instantly. Here's a detailed breakdown of what you need to do to import photos from your digital camera to your iDevice:
How to Import Photos from Digital Camera to iPhone and iPad
Step #1. Connect your camera's connector to the lightning to USB camera adapter cable.
Step #2. Connect the camera to the connector. Next, connect the lightning end to your iPhone.
Step #3. Switch on your camera. If your iPhone is switched off or locked, power it on / unlock it.
Step #4. In your iPhone or iPad, open the Photos app.
Step #5. In the menu, you'll see a new option called Import. Tap on it. You will see all your digital camera pictures there.
Step #6. Tap on the photos you want to select for importing. If you wish to select all, tap on Import All. (deselect all images to see the Import All button).
Step #7. After the transfer process, you will be asked to either “Delete” or “Keep” the pictures in camera. Choose the one appropriate for you.
Step #8. All the imported photos will go into a new album called Imported Photos & Videos.
That's about it. As you can see, it's relatively simple to import photos from your camera to the iPhone/iPad.
You can also import photos from an SD card. You'll need this lightning to SD Card Camera Reader adapter.
The steps are almost the same as above. Instead of attaching the camera, you're going just insert the SD card into the reader and the plug the lightning-end to your iPhone/iPad. Then, follow steps 4-8. You can import photos as well as videos. If you don't see a particular photo or video on the iPhone (that is on the camera, however), it could mean that the format was unsupported or the file on camera was corrupt.