The LT20-F Focusing Tube allows axial translation of one group of lenses relative to another. The focusing tube is simply a lens tube with a longer external thread and a locking nut. Provided in 2 inch diameter, the focusing tube screws into the internal threads of a standard lens tube and is locked in place with the lock nut. The maximum focusing range is 0.89 inch. A lens retaining ring is also included with each focusing tube.

• 使用

  2.0 in. Lens Tubes

• 镜片直径

  50.8 mm

• 调节

  Z

• 类型

  Lens Positioner

• 螺纹类型

  2.035-40

• 长度

  39.4 mm

• 行程，Z

  0.89 in.

LT20-F聚焦管允许一组透镜相对于另一组透镜的轴向平移。聚焦管是一种具有较长的外螺纹和锁紧螺母的透镜管。聚焦管直径2英寸，通过螺丝固定在标准透镜管的内部螺纹上，并用锁紧螺母锁紧。最大聚焦范围为0.89英寸。每个聚焦管还包括一个透镜保持环。