Mounting the lens - simple, just attach! When mounted display foil on the front and back of the iPhone - please arrange a remove - otherwise klappts!
Flash is covered by lens mount thus no longer function!
Image Quality: In the macro range just great!
Wide or Fisheyeaufnahmen are slightly out of focus and with slight color fringing at the edges of objects (especially when fisheye!)
Nevertheless: A fascinating extension for the camera of the iPhone and the purchase definitely worth!