CowboyStudio 2 way Macro Shot Focusing Focus Rail Slider for Nikon Canon Sony Camera D-SLR, 2 WAY MACRO RAIL
The CowboyStudio 2 way macro slider has smooth rack and pinion movement to provide extremely fine focusing adjustment. One 15cm rails can support movement of 2 directions---forward, back. Positive locking knobs assure rock-steady focus.If you purchase two Piece macro sliders, they can be combined into a 4-direction macro slider. And it can also be divided into two one-way macro slider, it is very simple to mix and split.