Experiments using a loupe with the camera of a mobile phone

I have had a chance to try the use of a simple loupe as a macro attachment, using blue-tac.  In particular, I used Loctitie Fun-Tak mounting putty.  The results were compelling. 

The blue mass is a blob of blue-tac.  The loupe is a relatively inexpensive one, attached by small bits of blue tac.  It was possible to work safely outside with the phoned, as the material held the lens firmly in place.  The lens was centered over the camera lens of an iPhone 6S+.  I used several different loupes.  One of them had an integrated led illuminator.