I was impressed at the view of diamonds and other jewels that I looked at and was able to photograph with my iPhone 5S. The two focus knob don't offer much adjustments. you must place the object you want to view right on the clear plastic housing. Lots of bright light provided on this unit. Priced well and works. Getting the case on and off is a pain, because it is a tight fit, but it holds the unit steady. I will buy more of these.