About the lens: if an object is placed at a distance > 2X focal length, an image distance will be at the 1X to 2X focal length, then will show an inverted, reduced real image. The 45X lens' focal length is very short, so what our eyes see is all call inverted, reduced real image. Widely Usage and Great Gift choice: Can be used for PCB board precision testing, diamonds, jewelry antique identification, skin pore observation, outdoor detail observation, reading, etc. A perfect gift for electronic engineers, appraiser, doctors, the elderly, students, etc. Everyone needs a magnifier: When you're reading books/newspaper... When you identify stamps, antique, jewelry, paper money, calligraphy and painting...ETC.