(Bernek) I just used cheap 6x reading glasses that I found on Amazon. I tried many types of lenses but reading glasses were the best. They are good optical aspherical lenses. You can find them cheap too. Look at my profile and I have done a write up on it. It works incredibly well. The one thing that also looks promising is the new Quanum 2 Pro that uses new lenses and has deeper focal length with a sleeve for your phone.