I recently acquired a Cognisys StackShot macro rail and am thinking I should get another manual focus rail to mount it on (at 90 degrees) to allow for lateral adjustments. However, I'm concerned about loss of rigidity in the system (i.e., Camera/Lens mounted on Cognisys, mounted at a right angle on manual focus rail, mounted on a ball head, mounted on a tripod). I'm looking at the Kirk FR-2 focusing rail for this purpose. If anyone has a set-up like this, I'd appreciate hearing from you as to how well it works, and if it negatively affects the quality of your results. I realize that rigidity issues can be managed by using a fixed (bench) set-up, but I want to have the flexibility to use the set-up out in the field.