This is for the Horseman-specific users. I would like to know the precise measure of extention length of the protruding t ele-lensboard. This specific lensboard is designed for Rodenstock APO Ronar 300m m, and will fit Fujinon C 300mm and Nikkor M 300mm as well, as the catalogue say s. It consists of two pieces, the base-tube and the top mount which can be screw on each other becoming an intact board (convenient for mounting lens on). Pleas e do not confuse with the one piece tele-board which is for shorter (240mm) lens . Response of where I can find this data is also appreciated. Thanks a lot!
Dongyun
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