You can often buy lenses 'in barrel' or 'in shutter' The lens you have purchased is was intended to be used with a Sinar Shutter on a Sinar/Horseman camera. This does not mean that you can't use it, you just have to work out some way of timing your exposures. A Packard shutter would work, if you go for a Sinar shutter make sure that it comes with the cables as they are required and both quite rare and very expensive.