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Home > Classifieds > Astromart Classifieds > Telescope - Reflectors > Classified #691036

For Sale: PortaBall 12.5" f/5 w/Zambuto mirror [SOLD]

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PortaBall 12.5" f/5 w/Zambuto mirror

Purchased new from Peter Smitka, around the time he switched to a f/5 mirror (around 2000 ~ 2004?).

I love this scope and hate to part with it, but I have a much higher priority project to fund at this time.

Full electrical package (fan, dew heater, etc.), top-end NGF crayford focuser, Mag1 finder, original three-legged base, shroud, cover, etc. All original docs, including Zambuto test report.

Mirror is very clean, so you won't need to worry about that. Peter gives easy cleaning instructions if you ever need to do so. Mirror and cell can be removed as a single unit, and will ship in a separate box for non-local sales.

The sphere is aluminum and is perfect save for one minor cosmetic paint scratch. Peter eventually switched to a fiberglass sphere, but then put in big vent holes, which IMO is an invitation for bugs (and dust) to take up residence. The aluminum version has no such holes (b/c it doesn't need them) and is dust and spider free as a result.

Eyepiece height at zenith is comfortable for me at 5'10". This is my wife's favorite scope, and she's only about 5' herself.

Collimation is the usual simple three-screw affair, but the primary doesn't really move and the secondary holds collimation very well. I have a nice H.G. green laser collimator,
but that's extra if you want it.

If you've never had a chance to use a ball scope, then you're in for a real treat. This scope is a joy to use, with no blind spots so observing at the zenith is easy. With its complete flexibility of movement, you can always position the eyepiece for comfortable viewing.

It's a star-hoppers dream at about the most aperture that's not too heavy (the whole shebang weighs about 62lbs) and doesn't need a step stool. Assembly is quick and easy for one person. When disassembled, everything fits inside the sphere except the truss poles, which have their own transport tube.

A local sale (Harvard, MA) would be ideal, but I will also ship within CONUS.

If you have any questions, please ask and I'll do my best to answer them.

Thanks for looking.

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