Q: How to I connect a MacBook Pro to an Optima Pro 360 Projector?

Just bought an Optima projector that I cannot get to work properly.  My MacBook Pro recognizes that the projector is connected in the preferences screen alingments but the Optima fails to recognize an input source for an image.  I am using the thunder to VGA adapter to connect to the Optima input VGA slot.  I visited the Apple Store but they were no help either as they suggested that I use a mini-displayPort to DVI adapter to connect to the Optima but then I don't have a mini-display Port to VGA or some other way to connect to the projector.  I went looking for a DVI to S cable adapter but no dice..apparently does not exist. Help please.