StackShot and the Extended Macro Rail
While the standard rail will fit the vast majority of focus stacking applications, you may want more length for your larger subjects or just more working distance. The extended length rail will give you 200 mm (8 in) of movement from one end to the other, this is double the 100 mm provided by standard macro length travel. If you plan to do high magnification stacks of small subjects stick with the standard rail as its shorter length makes for a more rigid system. But if you want to capture larger subjects or want more working distance then this is the rail for you. Even with its extended length this rail still maintains the same linear accuracy as its shorter cousin. The image below gives an idea of what is possible.
Many thanks to Bob Coates for the use of his images.
The image above is a focus stack of 48 combined images. It was captured using the Extended Length Macro rail and StackShot controller.
The image to the left is the first image in the stack. As you can see the depth of field for this image is quite shallow.
The Extended Rail
If you are already a StackShot user you can use your existing StackShot controller with no modifications or software updates with the extended macro rail. The rail is completely backwards compatible with the original controller. The extended rail is available with or without the StackShot controller.
Keep in mind when creating a focus stack that is the full 200 mm that you will loose the periphery of the image as the rail moves from back to font.
The extended rail, like its shorter cousin is made from black anodized aluminum and stainless steel rails and fasteners.