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Home > Classifieds > Astromart Classifieds > Antiques ASTRO ONLY > Classified #190889

For Sale: <PENDING SALE> Rare TEC 4" F 15 erect-image Maksutov-Gregorian

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Very hard to find, from the noted high-end Maksutov maker. The Maksutov-Gregorian design uses a convex instead of concave mensicus corrector so the spot secondary mirror gives an erect image straight thru with no diagonal needed. The ultimate terrestrial scope, can be used with a diagonal for astronomical.

Gives excellent star test, primary mirror focusing with coaxial thumbwheel around the ocular tube. Small secondary obstruction of 28% gives better contrast than typical catadioptrics. Comes with an interferogram and test report:

95.4% Strehl
.035 waves RMS
.216 waves peak to valley.

In excellent condition, recently collimated by TEC. Comes with mounting rail, caps and removable red-dot finder. Best offer over $500. Looking for an FS-102. No photo.
 

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