Collimation Cassegrain ASA/Keller

The ASA/Keller Cassegrain had been collimated by taking advantage of the Gryzbowski collimator, a Chesire collimator, a barlowed Laser collimator (adjustment of secondary mirror) and finally by a real star test at the sky (adjustment of primary mirror)...


Gryzbowski colli centralized on Secondary...


4 LED projection around Secondary Centercross


Chesire view


Startestpattern extrafocal


The intrafocal pattern of the star test looked equal to the extrafocal one ;-)

The seeing this night, at 20 degrees, was not 'optimal' but good enough to finish the adjustment of the primary mirror.


Flat after centering the optical elements


30 sec exp in focus



The CCDInspector plot with only 1 picture 10min autoguided



The CCDInspector 3D plot



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