From what I understand, you take the microscope lens and mount it to the front of your existing camera lens with an adapter and shoot that way. My research shows the following issues: 1) working distance. Make sure you don't have to be 1.5mm away from the subject, or something. 2) additional adapters. Some objectives require an additional correctional lens or insert to work. 3) achromatic correction is preferred. 4) magnification. They sell 2x, 4x, 5x, 10x, 20, 40x, 100x. I'm currently interested in the 10x, tho I should really probably start with the 4x honestly. Anything else you've run across that I need to consider?