The LT20-SP25-PK Tens Tube Spacer Set is a set of six black anodized aluminum rings sized to fit into LT20 and LH-2A 2 in. lens mounts. Much more efficient and effective than using retaining rings for spacing lenses, they are ideally suited for making fixed multi-element lens assemblies like collimators and beam expanders. These spacers are 25 mm thick and have a thin-wall design to maintain a 90% clear aperture. LT20-SP series spacers are also avaialble in six additional thicknesses from 0.5 to 25 mm.  Note that the LT20-SP05-PK 0.5 mm thick spacers are made from black Delrin (acetal plastic) and can also be used as protective washers.

该LT20- sp25 - pk管间隔套是一套六黑色阳极氧化铝环大小适合于LT20和LH-2A 2在。镜头坐骑。与使用挡圈进行间隔镜头相比，它们更高效、更有效，非常适合制作固定的多元素镜头组件，如准直器和光束扩展器。这些间隔是25毫米厚和薄壁设计，以保持90%的清晰的孔径。LT20-SP系列垫片还有6个额外的0.5 - 25mm厚度可供选择。请注意，LT20-SP05-PK 0.5 mm厚垫片由黑色聚甲醛(缩醛塑料)制成，也可以用作保护垫片。