Just measured, for Schneider APO Symmar 5.6/150 lens, from infinity to 4 feet, we need 26.3mm of movement, but the moving range on rail of 110B is 20.5mm, if we want the lens focus as close as 4 feet, 6mm more were needed.
Checked rail structure, looks like 4mm of expanding is possible, 6mm......, that needs some trick.
Don't think about 3feet focus, that needs 41.2mm, rebuild a rail? Forget it!
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