Bag of 50 pin bars number 2 (0.2mm) for RBT Stereo mounts (read description)

Description

While most mounts rely on slack built into the mount for vertical adjustments, RBT mounts use a clever method that allows vertical adjustments in discrete steps. Every RBT mounts requires a pair of pin bars. These go either on the upper or lower channel or one on the upper and on the lower channel.
If you look closely, the pin bars are not symmetric but they have two small holes on one side (up or down, depending on how you orient the pin bar). The film chip is shifted by 0.05mm towards the side of these holes. In addition, the two channels in the RBT mounts are not equally distanced, but the top channel is placed 0.3mm higher (to the top edge) than the bottom channel.
If you place the pin bars in the same channel with the same orientation then the film chips will be aligned vertically. By flipping the left pin to “look up”, the left film chip is raised by 0.1mm. By placing the pin bars in opposite channels with the holes facing each other the left chip is raised by 0.2mm. Two more combinations are possible which lead to 0.3 and 0.4mm shifts.
Since there are 4 ways to place each pin (2 channels + 2 orientations), there are 16 combinations for the pair of pin bars. Only 5 shifts are possible (0, 0.1-0.4mm). The rest of the combinations just shift the film chips slightly up or down. For example, putting the pin bars in the upper channel “facing up” pushes the film chips as far up as possible, while putting the film chips in the bottom channel “facing down” pushes the film chips as far down as possible, a difference of 0.4mm. This small shift might be useful in some cases.
The bottom line is that the RBT system offers vertical adjustments in 4 discrete steps of 0.1mm each. This system is particularly useful with certain stereo cameras in which one film chip is consistently higher or lower than the other (due to a slight offset of the lenses). I have seen this condition in many Stereo Realist cameras. In this case, if you know for example that the left chip is 0.1mm lower than the right chip, then you can always position the pin bars directly and immediately get perfect alignment with RBT mounts while other mounts might require tedious adjustments with each mount.
The RBT vertical offset system is a bit slow (switching placement of the pin bars requires setting the stereo window from scratch) and has been criticized for lack of accuracy since adjustments smaller than 0.10mm are not possible.
To answer this last point, RBT has introduced the so-called “0.10 Gray” pin bars, which when combined with the standard “0.05 White” pin bars they can produce adjustments in 0.05mm steps, and 0.5mm total shift
.
For those who want even greater range of shift, “0.20 Gray” pin bars are available, further increasing the total shift to 0.7mm. These are the pins for sale here. You are getting one bag of 0.2mm pin bars.
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