Heritage 150 Table Top DobsonianLarge 150mm aperture delivers crisp, contrast rich views of the moon, planets, and so much more Fast f 5 focal ratio, 750mm focal length Borosilicate parabolic primary mirror with Sky Watchers proprietary Metallic High Transmission Coatings (MHTC) Collapsible truss tube design retains collimation while providing increased portability and easy storage 1. 25 inch helical focuser Tabletop design with rubber feet to minimize vibration and increased