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Michael Peter

31 Mar 2011 14:47



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Se pare ca nu e doar o problema de colimare la telescopul meu

Inca unu care are probleme cu Telescopul Bresser Pluto :


http://home.zonnet.nl/m.m.j.meijer/Equipment/Bresser.htm

Ia uite ce spune:
Bresser Pluto, 114mm F/5 Newtonian
 

Because this was my first telescope, I was very pleased with it for a while. But then I noticed there were some strange things going on.
First the collimation was way off, so I re-collimated (only roughly as appeared later). Another thing was the flimsy tripod and EQ-1 mount. Not at all suited for this sort of telescope.
But the worst thing, apart from the bad eyepieces that came with the scope, showed after some calculations I made after collimating the scope.
During collimation it showed that there was quite a lot of light that traveled beyond the secondary mirror, and so leaving the tube. I thought this was strange, and adjusted the secondary. Still a lot of light went out. Realizing any adjustments wouldn't solve the problem, I took some measurements. Using a streetlight some hundreds of meters away, I found that the focal length of the scope was only a mere 450 mm. where advertised was F/5.
Initially I didn't find that discovery very alarming, but the fact that the secondary mirror only caught about the amount of light equivalent to a 75 mm. primary was worrying me. I realized that mayor steps had to be taken to correct all this, and I left it in the original state.