EPP - iPads instead of document cameras

During GPP, I used the document cameras a lot to show good work or examples on the screen for students to use. But not all classrooms have document cameras! However, I observed a lesson where and iPad was used instead!  The teacher' iPad was synced to the computer / smartboard and the smartboard showed what was on the iPad screen. The teacher took a photo of a student's exemplary work and this was shown on the smartboard screen for everyone to see. It was just so quick and it was a great example of using available resources!