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Mircea Pteancu

08 Sep 2011 22:52



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'' Iar se intampla''.
Iata telescopul lui Mark Christensen cu apertura de 152mm F/2.74 ,respectiv F/3.1 deoarece ParaCorr 2 are un usor efect de alungire a focalului ,telescop prezentat pe atm free.

Comentariul lui Mark pentru aceasta poza:

''6 inch f/2.74 parabolic mirror, normally used with ParaCorr Type 2 coma corrector to produce f/3.1 system. AL tubing and Zinc Chromate primer from 1960s. Mirror was originally ground and polished around 1972 but as finally figured in the Spring of 2011. These things sometimes take a while''

Mircea