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Rodenstock / ALPA Macro Switar 5.6/105 mm - custom made for ALPA by Rodenstock; without shutter to be combined particularly with ALPA 12 FPS; recommended reproduction scale 1:4 to 4:1; optimizable by continous adjustment ring from scale 1:3 to 3:1; V Groove adaptation to ALPA universal bellow or to individually assembled extension tubes.
V型槽安装允许 "旋转 "安装镜头。这一事实对这种类型的光学器件非常有利，因为可以很容易地实现最佳的镜头方向。罗敦司得在镜头最终组装和调整后确定这个最佳位置。这个最佳位置在全新的镜头上有一个可移动的圆点。安装时，这个红点应该指向12点的位置。
