A co worker of mine showed me a cool mod he did to his Cell phone. Took the lens out of a cheap Dollar Store Laser pointer. Cut a piece of tube that the inside diameter matched the outside diameter of the lens. Then mounted it in front of the camera on his Smart phone. Now you have a 130x zoom. We used it to find where the the helium leaks were on a cryostat.
Its the lens off a laser pointer like this.