I am wondering if there is a way to use my barrel lenses on my Tachihara? Currently I am using them on a speed graphic, carrying both the Tach and the speed is too much so I usually choose one or the other. I would like to use my brass lenses on the Tach. Is there a shutter available to allow for speeds from 1/30- 1/500? The packard seems to be for time exposures only is that correct.