The 6219 Secondary Focusing Lens Assembly for Light Sources is used to focus the collimated beam from a condenser and create an image of the arc or filament one focal length (6 inches) away. It consists of a 2 inch (50.8 mm) diameter fused silica plano convex lens and a 2 Inch Series flanged lens holder. It has a 1.8 in. (46 mm) clear aperture, and F/3.3. The model 6222 2 inch lens holder is also available separately if you need to mount a different focal length lens.

用于光源的6219次聚焦透镜组件用于聚焦来自冷凝器的准直光束，并创建一个1焦距(6英寸)的弧或长丝的图像。它由一个2英寸(50.8 mm)直径熔融二氧化硅平面凸透镜和一个2英寸系列法兰透镜支架组成。它有1。8英寸。(46 mm)光圈，F/3.3。如果你需要安装不同的焦距镜头，6222型2英寸镜头架也可以单独使用。