Fig. (1) Schematic of the QBC ParaLens™ attachment for fluorescent microscopy [3]. 1. Standard threading. 2. Blue LED light source. 3. Focusing Lens. 4. Excitation filter (385-480 nm). 5. Dichroic beam splitter (reflects blue light downward, allows fluorescent light from specimen to pass to user). 6. Objective lens (60x oil). 7. Emission filter.