First light in a deepsky, at
Passo Maniva (BS, Italian Alps) at 2150m heigth.
This scope was built by one of my
friends, Gianfranco Maccagnan of Imperia, Italy. A Newtonian telescope
is a classical optical scheme, simple to build but quite bulky. The
optics of this 310mm f/5 Newton are really good, with an average
measured error of lambda/13. The obstruction is 22% (68mm secondary
mirror). This value is really good also for planets, but at the same
give full illumination on my CCD camera. The weigth is about 30kg, near
the limit of my mount. The primary mirror is 70mm thich.
View of the rear of primary
mirror cell with the three point setting and the holes for ventilation
My CCD camera at the focus of
the Newton, with a motorized focuser.
mini-coloumn, 50cm high, that make the observations a lot easier,
avoiding to use a stair.