Focus the slide by turning the coarse focus so the stage moves away from the objective lens. Rotate the objectives so that the high-power objective, eg x 40, is in line with the stage. Bring the ...

Optics: BK-7 Solar filter: White-light solar filter (ISO 12312-2:2015(E)) Design: Porro prism Magnification: 20x Objective lens ... solar binoculars is their high power. At 20x magnification ...