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 Portaball 18 inch f/4.5

We will be adding more information soon regarding the addition of the 18" f/4.5 Portaball to the Mag 1 product line.

Contact us for more information.


Sphere size & composition 29 inch Diameter Seamless Fiberglass
Upper tube assembly construction 22 inch O.D. Laminate composite
Trusses 1.5 inch O.D. anodized aluminum
Circular composite with PFA bearing
Optics manufacturer Zambuto Optical Co.
Aperture 18 inches
Focal Ratio f/4.5
Primary mirror thickness 1.625 inches, in removable cell
Secondary size (minor axis) 3.1 inches
Secondary obstruction (diameter) 17%(minimal diffraction)
Size and type of focuser 2 inch Starlight Instruments
Finder Quik Finder by Rigel Systems
Eyepiece height at zenith Custom fit to your eye height, 62 inches min.
Weight of heaviest component
~ 90 pounds