KEH has various models of the Horseman 450 at good prices, but I have no clue as to the different models. There is a 450b, a 450 with an extensible rail, and some others. I am looking for this as a backup camera for two uses - a more rigid base for my 400mm Fuji telephoto, and a more flexible mount for my 90mm for architecture, both as compared to my Technika IV.
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