From Van Slyke Engineering, the Slider's front, top, and rear ports are 2-inch format with a profile of 3.5 inches, including the built-in 2" filter slot. It is designed to be used for short unguided time exposures or with CCD cameras that have an incorporated guiding chip or dedicated chip section. Slide mirror position is conveniently controlled with the Slider push-pull rod located on the end of the housing .
Slider 1 Optical Manifold: USD$595 new. Sell: AUD$450 with free shipping domestically.
More info:
http://www.observatory.org/slider1.htm
Thanks, Al
