Came across an article about an Iranian student taking pictures of the inside of mosques in Iran, using fish eye and ultra wide angle lenses.
Here is his website: http://gravity.ir/
Truly a different perspective.
Count me in
For sure you will be checked thoroughly. The recent stories about IS volunteers has brought the attention to everyone traveling into the region.
You might also want to check your previous visa in passport. Iran's immigration officers are very sensitive towards visa from countries like USA, Israel etc.